DIY Pond Filter

Learn how to make your own natural and efficient biological pond filter. More at http://www.pondalgaesolutions.com/blog

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Автор Brian Z ( назад)
Wow, 2 whole pictures

Автор Lemony Snicket ( назад)
I have used a 100 gallon filter like this in a 3000 gallon pond with a 3000gph pump and skimmer for 16 years. I use 1.25 inch bio balls in laundry bags for media which makes for easy handling and cleaning by simply using the 2" spa pvc supply/pump line to simply back flow rinse the media in the tank with my pond water so that I minimize bacteria and beneficial damage. I can easily remove the media since the bio balls are in laundry bags to do a total wash out. I never use tap water for washing out. Only pond water and then refill pond since I drained out a bit doing the purge. I use a 15 foot pool hose on the drain of my tank out the back so I can direct the discharge water to a spot in the garden. I use Microbe-lift pl for filter replinish.

Автор Rogue Shadow ( назад)
How to do this with a 55 gallon barrel ( 300 gallon stock tank as pond) drill a hole in near the very bottom of the barrel, use a water proof seal around the hole, connect the drainage hole to the hole in the 55 gallon ( 300 gallon must be above 55 gallon hole) , make an overflow for the 55 gallon, put what ever media and plants you want in the 55 gallon, voila

Автор ciindianapolis ( назад)
how to prime the filter at the first place after building the filter

Автор bsessley55 ( назад)
hello will this system take care of the ammonia, nitrate and nitrites

Автор Iris Vazquez ( назад)
Great idea and simple. Thanks I tray that.

Автор chris Phelan ( назад)
Where do I get these floor pads ??

Автор Roxie .Fan ( назад)
Hello, Where do you buy your floor cleaning pads? Thanks!

Автор PalJoey1957 ( назад)
The only thing is, with this type of bottom up water flow through the filter, you need to have an excellent pre-filter
(straining system) to avoid the heavy addition of solid materials (leaf fall, etc.) that would clog the system and require the type of filter cleaning you want to avoid.

That is why I myself prefer a top down water flow with a couple of screens built into the filter box, and then an upper layer of polyester fiber.  It's about accessability.  If needed, rinse off the screen, and replace the inexpensive polyester, which will quickly become re-populated with bacteria because you're keeping in place the under-layers of permanent media.

In this configuration you lower a 'standpipe' to within a couple of inches of the bottom and screen it off to allow free flow.  Place an elbow at the top and connect it with another pipe to the exit port.  Make this exit a couple of inches lower than the input and you are set with a filter that is 'permanent,' but can be easily cleaned in case of overload.  Remember the rule of thumb of making the exit port 2X or better the size of the input pipe.  No check valve needed.

Автор jerry osborn ( назад)

Автор 1213amg ( назад)
Thanks Mark....right now my pond is too shallow and small....to be exact it 18" deep and 4 ft X 11 ft long.  I'm thinking make a 5 ft x 11 ft and 5 ft deep....so is this mean I'm  gonna bye a bigger pump right.  Thank you once again for quick response.

Автор 1213amg ( назад)
Hi Mark....my name is Seth I have a small Koi pond about 660 gals and only 18" deep....I want to know if I can rebuild the pond and the fish I have in there can be save....also I bought a UV bio filter that can takes 1200 gals per hours.  does this mean I have to build a new bio filter and a bigger water pump? thanks.

Автор Ron Jacobsen ( назад)
I am building a 5000 gal. pond and would like to build 2 - 150 gal bio filters. My question is placement of filters. Do I place them up near the water fall? Also do I plum them separately flowing into one location for falls?

Автор rik680 (1509 лет назад)
Settling Tank ,,
I used this skippy filter to hold some crushed coral to buffer the ph ( did not work for me ) and also to hold some bags of activated charcoal that I use in the beginning of each season which works great due to the up lift action  . One thing for sure , you can go in many directions for koi pond application with this design   . But the one surprise that i got out of it is that it turned out to be a great settling tank . After installation my pond got crystal clear of all the floatys and murkiness  in the water and that was without bio media . Fun to build but i recommend using a bulkhead fitting then shc 40  as a return to your koi pond 

Автор Robert Couse-Baker ( назад)
Thanks.  Very informative.

Автор klmgroupia ( назад)
This reply is for 11atlantica.  For some reason I'm not able to reply directly to your questions in the comments.  First, bacteria is added into the pond body then circulated through the filter.  Second, if you're having problems with the function of the design, be sure to head over to skippysstuff.com and review the full instructions there to make sure you set everything up right. 

Автор 11atlantica ( назад)
Why doesn't one "prime" the bacteria in the pond, rather than in the filter?

Автор 11atlantica ( назад)
Help.  I built this. What prevents the water from pouring over the tub?
Mine worked the first time I used it to test it. The water rose to the bottom of the top pipe and stopped.  Then when I went to hide the hoses and position the pump so that the top of it couldn't be seen, then turned it all again, the water fills and pour over the top even with the lid on. What dd I do wrong?

Автор Jon Nannen ( назад)
How many GPH pump would this filter system require?

Автор mikejessmax ( назад)
Great filter, I've had a 70gal model running on my pond for 4 years. Finally cleaned it this year, just a very fine STINKY sediment in the bottom.

Автор lanesteele240 ( назад)
I want a nippler. You vid is clean crisp and to the point. Great job

Автор MrFeshamon ( назад)
so what kind of bacteria do you use for your filter/pond?  what is this bacteria called?

Автор Bryan Mills ( назад)
I built the same style filter but utilized only red lava rock as my media. No separation screen in my set-up but I may add one. Lava is so porous it is perfect for growing the bacteria.

Автор Phillphine ( назад)
hello, I just finished my filter this weekend and a thought occurred to me when I noticed the water on top is kind of still. I'm considering mosquito dunks just in case, but was wondering if they might effect the beneficial bacteria I try to develop later. like if it might kill them like the mosquito larve.

also, once I got curious about this and tried to look up some info, I read that the dunks release a type of bacteria them selves. could it be the same type of bacteria? that would kind of kill two birds with one stone. thanks if you happen to know.

Автор drtrolish ( назад)
Its a good system but to me it needs actual filter media pads for mechanical filtration that can be taken out and cleaned. That would be in place of the small scrubbing pads. If you just want it to be a bio filter then why not use all bio balls, they collect less crude than those sponge pads will and keep nitrates in check better. 
Over time waste does build up in those pads and will give off more nitrates than the bacteria can handle so the filter needs to be able to be cleaned to me.

Автор Mudcat50 ( назад)
I have 2 pumps, one which runs to something similar to a skippy and another that is inside a cat litter container with media, that is submerged in the water. A couple of questions.
1. What would you used to distribute the outflow from the skippy filter? It's coming out of that closet flange. How large is that? 4"? 6"? I use 1 1/4" hoses for the most part.
2. My biggest problem is keeping my pumps free of debris. I've found I can't just put an unprotected pump in the water, it has to be IN something, otherwise a curious fish will get stuck on it. Any ideas?

Автор Mike Poamoho ( назад)
mike here .. what is the process and how do u use the beneficial bacteria? 

Автор Renee Kirk ( назад)
Would something lie this be helpful for a duck pond? I have 6 ducks and I'm beyond tired of the kiddie pool so decided to put in a larger pond. I would like some kind of assistance at the very least with cleaning it from time to time. Wondering if this could work?

Автор Robinson Reyna ( назад)
Hi...the inlet hose from the pump first goes to the top of the filter, then the water goes all the way down and directed to two elbows on the corners, which creates a circular flow. Why the water has to be fed from the top? You can drill a hole at one of the side walls and feed directly to the T-junction. That way you will  (1) save couple of elbows and  (2) the total head will be reduced by the equivalent height of the filter. Both of this can result in increased water flow. The only reason I can think of is in case the pump starts taking the water back, then the debris can go inside the pump, in ideal case it wont happen. Or is there any specific reason for feeding the water from top?

Автор klmgroupia ( назад)
Hi Phil...you can use any good general pond bacteria to prime these. On our site we suggest using the 2500 dispenser system and this comes with a 2 month supply which should get you going well. If you go to our site at Pond Algae Solutions and search for 2500 it will come up for you and you can read more about this particular product.

Автор Phil Colby ( назад)
Where does one get pond filter bacteria ?

Автор klmgroupia ( назад)
It's not really your fault Dan, utube doesn't let us put links in the comments. If the link above I mentioned didn't work right, try it now...it was redirecting to the wrong place after we moved the blog. This is right under the video, where it says Uploaded on March 12 you should see the blog address aver the words More at...then search for skippy filter once you get to our blog.

Автор Dan Moore ( назад)
I can't seem to find the link that you are talking about the update on how to care for this filter, very interested though. Please instruct an old computer idiot on how to get there. LOL Thanks

Автор klmgroupia ( назад)
Hey Dan, good going. Now just a note here...don't be shocked if you do see green water early on. It can come and go as things get established but after a few weeks you should see things stabilize for good. Not saying you will see green water but you might. Also be sure to visit our blog (link below the video) and search on skippy there. I did an update on how to care of this filter over time and keep it working well. It's in addition to what's in the video. All the best!

Автор Dan Moore ( назад)
Bio-filter finished & after 4 days the difference in my water is wonderful. Thank you again for all your help. My pond is 3500 Gal.

Автор klmgroupia ( назад)
Hi Julius...well this particular filter and most like it usually pump water from the bottom upwards, then it spills out the hole near the top, which works kind of like a waterfall bio filter, or it can I should say. That's the only way I've used them, bottom to top.

Автор klmgroupia ( назад)
Yep, the inside stuff is what's important, the container not as much. So no worries about the stock tank.

Автор Julius Bersola ( назад)
can i use this same materials, even though i do not use a rubbermaid stock tank? i dont have the budget to purchase a stock tank

Автор Julius Bersola ( назад)
is it better to pump the water in from the bottom so that it will filter better or from the top?

Автор klmgroupia ( назад)
Well done Terry...and thank you!

Автор terry barrett ( назад)
very small pond 500 gal, i made a pond filter from 15 gal removeable top blue barrel. i then cut out holes one low and 1 high on the barrel and added round pvc flanges to the barrel, then for filters i used the round floor scrubbing pads in 3 different sizes and pumped the water in the top flowing toward the bottom. the barrel is actually sealed and pressurized. really cleans up the water when their is enough bacteria. very similar to your design process. works the same way. nicely done video!

Автор Dan Moore ( назад)
I just wanted to say thank you again. Can't wait to get this completed. I recieved my rubbermaid 100 gal. stock tank that i purchased from zorrotools for 79.99, now to get it going.

Автор klmgroupia ( назад)
Hi Terri...on the lava rock, no, color wouldn't matter as far as I know. Ceiling light grids, I've seen these most large home product stores, home depot, lowes, etc. In the ceiling tile section. Maybe they've gone out of style but for some commercial installs I still see them used...they are usually 2'x4' in size. Any grid type structure would work though.

Автор Dan Moore ( назад)
Thank you very much. Btw iam Terri, dans wife. We do have 2 more questions & we really do appreciate your time & answers.
#1. I went to walmart today & bought Lava rock it was red in a o.5 cubic ft. the lady said they have black lava rock by the grills or red outside in bags, i value shopped & purchased the red ( does it matter?)
#2. I am havine great difficulty finding the ceiling light grid, any ideas as to where i can get these?

Автор klmgroupia ( назад)
Hi Dan...you can use any size of flange you like I suspect. In terms of running uphill, that would generally be based on your pump capability. These filters are very basic obviously and your main task is just to get water into them from the bottom, and as it rises, the filter pads will capture debris, etc and the water will run out the top...which could be either directly back into the pond or via a waterfall configuration. By design you might also look at a bio-falls kit. Same principal.

Автор Dan Moore ( назад)
I was wondering about the closet flange? I was wanting to run 2 outlets to my water features, so would they both need to be 4" in size or should i use smaller sizes? Also i need to run one line uphill to operate my waterfall, i probably can't operate this due to gravity ( correct)? I do more cooking than plumbing this ought to be interesting, hope i can do it right.

Автор klmgroupia ( назад)
Hi Dana...I consider any pond with filtration kind of like small pond (managed by mechanicals). A large pond would have no form of filtration generally. In my mind you have to look at supporting a good bacteria count. Some form of aeration and supplementing beneficial bacteria may prove helpful. It can also clean up organic debris that may drop to the bottom of the pond and infuse your media with good bacteria too.

Автор Dana Rand ( назад)
I see the majority of the comments made in this forum are for ponds of less than 10,000 gallons.
My pond is about 60,000 and has a "media filter" in the upper bog area. It runs down over a waterfall and then returns through two skimmers and a mid-level return. I know need to remove any and all debris from the bottom of the pond, But I think I need to add additional filtering to help rid us of this yearly issue. The bank is running dry. Very frustrating. Any help?

Автор klmgroupia ( назад)
You could do either but I think it's good to cover it with something. Plywood is fine with plants or rocks on top of that perhaps, just to make it look better.

Автор klmgroupia ( назад)
We use the beneficial bacteria on our site at pond algae solutions. The 2500 dispenser system works pretty good for this because it time releases good bacteria out for a full month at a time.

Автор klmgroupia ( назад)
Usually the actual media is filter pads or traditional media you'd find commercially. If I were going to use plants I'd probably just work on creating a bog filter or something like that.

Автор klmgroupia ( назад)
Hey Joe...actually the pads used suggested in the video serve as the mechanical filter as well as the home for the beneficial bacteria...it serves both purposes. In whatever filter you're using, whatever material is trapping and removing elements from the water that you don't want would, at least to me, be the mechanical filter part of the system.

Автор klmgroupia ( назад)
Have you searched online? It might go by another name, such as adapter or converter...I'm not sure. You might visit a site called skippystuff or something like that and they may have some parts that woud work for you.

Автор klmgroupia ( назад)
No, no cords or power are needed.

Автор klmgroupia ( назад)
Well not normally because all the inorganic stuff settles down there and you'll eventually want to remove that. Normally I'm not sure how well plants would do in this, if they aren't covered and get some sun, and elevated off the bottom it might work. Usually though media is put in there for the bacteria to grow on, and this is suspended above the bottom for the settling I mentioned above.

Автор 1065Olivia ( назад)
I always use air conditioner filters. The softer type that do not disentegrate which you trim your self. Has worked great for years in my 4000 gallon koi pond. Home Depot carrys the type and they are generally $8.00 and are blue.

Автор Andrew Beattie ( назад)
Nice! I used a standard yard bin and used similar materials as you and it works great! Crystal clear pond 5 months in...and it use to be like pea green soup. I have 2 sections in my pond, the smaller half overflows into the large part and the amount of green sludge that sinks to the bottom of small part could fill at least a 6 liter bucket. A simple syphon will suck it right off the bottom nicely.

Автор Sonya Serna ( назад)
can plants be added to this filter and gravel for them to live in?

Автор Charles Farren ( назад)
Had the same problem instead used scrap green plastic banding from work. Cost was free and after two weeks my 5000 gallon pond is clear to the bottom ( 3 feet ), am very happy

Автор Dialysisforever ( назад)
When I bought my house, this is similar to what was present. I modified it because leaves and pinecones were being sucked into the filter and I could not get to them to clean them out easily. I bought 4 sheets of green filter media approx 4 ft x 3 ft and set them up horizontally supported by the light grate . The water would fall into the rubbermaid container on one side of the filter and flow through to the other side and back out to the waterfall. I have been running this way for 6 years.

Автор Bilbert Pounchnuckle ( назад)
Hi, I prefer to use a bulkhead fitting for any through holes on the line, skimmer, etc. I would avoid using silicone, as it doesn't tend to handle the flexing and movement of rubber and/or plastic. So the secret product I use to seal the fitting is.... Plumbers Goop. You can find it in the super glue section. It works extremely well as a sealant/adhesive. After using this method I have not had any leaks in roughly 8 years. Use it sparingly as toxins could be a concern.

Автор klmgroupia ( назад)
Keep in mind that the filter in this case isn't under pressure other than gravity you might say. The basin simply fills up "through" the media and then the water exits out the top porthole. Probably for the most secure fit, you might look for something that a pool supply would use to construct the pvc tubing into a pressurized pool filter. These couplings are under more pressure so I'm sure it would work in this case with the diy pond filter. In all honesty I think pvc glue would work fine

Автор Andrew Honnold ( назад)
How would you go about attaching the input hose to the PVC pipe without having it leak? With high powered pumps you will need a good seal and it's the one thing i'm not positive how to do.

Автор gboss454 ( назад)
what is a nipple reducer??? I can't find one anywhere??!!

Автор Katherine Smith ( назад)
Welcome thanks for the reply!

Автор Mark Washburn ( назад)
Well you'll have to pay for that one:) Alll kidding aside, this is just a bit of a primer to show what's possible. watching one of these run isn't much better than watching paint dry because they're so simple. Sometime I might actually go through the steps of building one and running it, but at the moment time doesn't allow such frivolities. Thanks for asking though!

Автор Katherine Smith (31 год назад)
I kept waiting for footage of how it actually works and was sadly disappointed... *sigh* Can we get an actual video instead of a slideshow :-(

Автор Alex Ross ( назад)
I have two of the 100g Skippy-style biological filters in operation for our 5,000 gallon Koi pond....and they do readily gunk up. What recommendations do you have for mechanical filtration to prevent this?

Автор klmgroupia ( назад)
@aviewtoathrill pine needles can be a real pain as you know. A filter won't help much on these if they end up sinking to the bottom pretty quickly. Same with a skimmer, but if they do float for very long (some might, some won't) then a skimmer would be a definite addition and a filter could be good but optional. A skimmer with fairly tightly meshed catch basin would probably help a lot.

If you get a lot of this debris on the bottom then a pond vac might be the best option.

Автор aviewtoathrill ( назад)
Hi, My 2400 gallon pond has been filterless for the past ten years. However, I'm tired of cleaning the pine needles out every year and I know that I need to do this. I have the stock tank and some of the floor scrubbies and most of the pvc as I was planning to do a skippy filter years ago. Since the pond sits under six tall pines, is this the right filter for me? I would think that the needles would need to be collected often during the fall. I have no fish only plants and pine needles!!

Автор klmgroupia ( назад)
@joker66599 sure you could use a uv light in combination with one of these. you could put it inline in front of the filter...then the filter will catch the dead and dying algae cells. also if green water is your main issue you could tinker with the type of media...finer media will filter out more. often once the bacteria get's established it will help with green water but not always, and so a uv light could be useful.

Автор klmgroupia ( назад)
@SidelineHero10 hey, you're welcome. A good idea is a good idea.

Автор Starrwulf7 ( назад)
@nhowland52 sounds like your media is too 'tight'... you might want to switch to a coarser media.

Автор Nelly Crowe ( назад)
I'm interested in making a filter for a small (180 gallons) pound. Any suggestions?

Автор klmgroupia ( назад)
@BigBoyLies - Usually no...the skippy filter will work fine all on it's own.

Автор Emmanuel Thommy ( назад)
do you need a prefilter for this kind of filtratin system?

Автор enticed2zeitgeist ( назад)
@klmsolutions Wise answer! Thank you very much man! I really appreciate you taking the time to answer my questions. Namaste

Автор klmsolutions ( назад)
@enticed2zeitgeist - I honestly haven't found them to be a problem and this type of filter has been in use for some years now. As I said their just commercial floor scrubby pads (and I normally suggest people search online for these and see what they can find. You can probably ask the manufacturer of your concerns and they would be the best resource. If in doubt or your uncomfortable with such things, then use pond filter pads in place of them. In the end, that's probably your best bet.

Автор enticed2zeitgeist ( назад)
@klmsolutions I get that they are just scrubby pads with out any soap added into them and such, but it's not safe to just add "dry" plastic objects into water is it? I know the recycle number associated with various plastics declares it's usage. From my research it is not safe to just add random plastic objects into water assuming that because it's plastic it's safe. If you aren't aware of what kind of plastic those scrubby pads are made of how can you be sure they don't leech into the water?

Автор klmsolutions ( назад)
@enticed2zeitgeist - those are just floor scrubby pads, no additives or anything. You could also simply cut up a standard filter pad (medium porous) that you would normally put in a pond filter. Just cut those up into blocks and put them loosely in the tub. I think that would work fine too.

Автор enticed2zeitgeist ( назад)
What are those floor sponges made out of? Does it leech anything into the water? I was thinking about using that sponge stuff for an aquaponic filter but I'm concerned about leeching.

Автор Derrick Orberg ( назад)
Great job with the video and parts list and the very benficial commentary. So many bad ones out there, wanted to make sure you got some credit. Derrick

Автор klmsolutions ( назад)
@africancichlidman - look for commercial floor scrubber pads, that's really all they are and you cut them into smaller pieces. You can also use any kind of filter media that you like in the filter. You might see this is bioballs, plastic coils, small foamy pads in a mesh bag...there's a lot of these things for sale on the market.

Автор indianawhitetail806 ( назад)
where do you get your sponges?

Автор klmsolutions ( назад)
This is tough but the best advice I can give is the less you disturb the bio media the better off you'll be. Some filters come with pre-filters which can be cleaned but many diy filters do not...they just contain the bio media. Installing a skimmer (if you don't have one) may help too just to keep the big stuff out.

Автор klmsolutions ( назад)
As long as it doesn't dry out you should be ok...some bacteria will survive, but I would still prime things up once you get the new filter going just to be sure the counts are up.

Автор Noreen Howland ( назад)
another question. If I decide to build a filter like the one you suggest, do you think there would be a problem of taking the bio-media out of my current filter and transfering it to the new filter? Would the bacteria survive the transfer? I dont think my current filter is adequit, but I dont want to have to start from scratch as far as the microbes I already have

Автор Noreen Howland ( назад)
quick question. I know not to clean out the filter, but I have problems with the filter getting clogged with either waste or algae. It gets to the point where the water doesn flow to the bottom of the filter. I usually just clean the media at the top. Is that a no no?

Автор Osren ( назад)
you can SITE TO STORE ship "Rubbermaid Stock Tanks" to many "Do It Best" hardware stores as well ;)

Автор klmgroupia ( назад)
@Soper79 - normally no they don't. But you can cover them with plywood or something like that just to keep stuff from falling in. Usually people put rocks, plants, or various other concealers on and around the tub to hide it better.

Автор Soper79 ( назад)
Simple/dumb question here. Does the stock tank come with a lid? Or are these filters simply exposed on the top. Thanks.

Автор helicrashpro ( назад)
@rik680 I agree slightly, but this is not always the case. It somewhat is determined by the pond water bio-load. If you are referring to standard bio-load to a specific size pond/aquarium than almost all filters are overrated by the manufacturer but saying you should double the filtering, I would say is not a completely accurate rule of thumb but is a safe rule of thumb to use.

Автор ALP'ie ( назад)
@rik680 I know. I sold all my filters to my friends for cheap, and made my own diy, lol, I will have 4x filtration soon.

Автор rik680 ( назад)
just a basic fact . Filter manufacturers grossly over rate there filters on purpose .
That 15'000 gal bead filter you referred to , would need to be a 30,000 filter .
To filter 15,000 gal pond . You always have to double the size of a commercial filter to get the proper filtration , pond or aquarium .

Автор rik680 ( назад)
@klmgroupia Filter manufactures are notorious for under rating there filters .
All of them , aquarium or pond filter makers . Buy the time you find out
you are under filtered its to late and you have to spend more money for proper filtration . If there filter say 1500 gallon you would have to double there filter to 3000 gal filter ,for a small fish load .

Автор Son Nguyen ( назад)
This pretty simple, and love to give this a try. But where do you buy the media (pads)? What kind? How much? On skippy, he said floor scrubbing pads, you say simple floor cleaning scratch pads. I tried searching online and closest thing comes up, cost more then $100. On skippy site, 3 bags for $75. Could anyone tell me, where they gets theirs and how much.

Автор dolittle1992 ( назад)
I did something similar, I took two 55 gallon drums and set them up with a smaller grate and the same pipe, then I filled them with number 8 gravel, the gravel doesn't fall down into the gunk trap at the bottom and I planted some bog plants in the top. Do you think this will work like the design you just showed. If not how can I fix it with an EXTREMELY limited budget. thanks

Автор Danny Higdon ( назад)
anybody lookin to make a cheap homemade weir for their skippy bio filter should check out my videos,im still in the process of getting them uploaded though.i looked all over the internet and you tube to find information on making a decent size weir to incorporate with my skippys filter with no results.I finally came up with my own solution, which was cheap and pretty easy.

Автор ALP'ie ( назад)
@nightstalkerrc Thanks for the heads up! =) I actually might try it. Cause i have a pond which is around, 2,000 Gallons. Alllllll my bead filters i sold, i never knew people liked them so much! They were gone within a day and i sold them for like $1000.00 for the new ones and i sold the used one for $400.00 which my cousin was using.

Автор nightstalkerrc ( назад)
with the flush valve..you just open the valve and the water rushing down and out of the filter will eliminate much of the fish waste and other organic matter from the system witout removing the live bacterial colony... if you build one of these you'll find it performs extremely well, and with the addition of the flush valve its maintainence is minimum. i flush mine once a week.. takes less than a minute. this increases the filters efficiency by decreasing its work load.

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