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Thread: New pond filter

  1. #1

    New pond filter

    Hi everyone

    After a disastrous and very expensive refit in our old house we have decided to dig our own pond in our new house. We have some experience. However we are newbies to fish keeping but have fallen in love with them. We are looking at a pond of about 20 000L . We are confident we can do a better job with the hole and lining. We have to find an appropriate filter with UV etc. Does anyone have any recommendations as to type /make. We are happy to get mucky but want something simple for routine maintenance.

    Cheers



  2. #2
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    Hi and welcome.

    If you want the best filtration involving minimal maintenance, then I'd recommend a drum filter (for mechanical filtration) and then a moving bed filter for biological filtration.

    An alternative to a moving bed filter would be an anoxic chamber.

    For UV I would recommend a 'drop in' Amalgam UV filter and in terms of pond pumps, I would strongly suggest looking into using an air lift to pump water back into your pond.

    20k litres sounds like a decent size and you should be able to have quite a few koi in a pond of that size.

    I'd recommend doing some research (use the search function on this forum) for pond build diaries. You ideally want to learn from others mistakes as mistakes in poor design or building of the pond can become costly, or leave you not quite happy with the end result.

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  4. #3
    Thanks Twhitenosugar

    We have had so many problems with leaks we do not want to risk having a drain hole thingy at the bottom. I believe we will need a pressurised system. Our previous one, Evolution aqua K advanced with UVlight is very good but I have no idea how to maintain it, we have struggled to get someone to do an annual check, hence our desire to get a simple , easy to maintain system. We had a terrible problem with string algae, after a dose of chemicals it cleared although I thought the UV light would’ve avoided that problem???

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  6. #4
    Member Rank = Sansai 118's Avatar
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    Hi guys

    There's pro's and con's to every system, whether it be gravity or pump fed. What is important though is maintaining your new found enthusiasm, let alone deciding which ever system suits your budget best. Pond siting will play a factor in reducing algae too.. so as has been written before, read up on where others have made mistakes and do your utmost to avoid similar. We all make them, so you won't be alone in doing so. Enjoy your koi project in your new home and there'll be plenty of advice waiting for sure, to keep you enjoying yourselves..

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  8. #5
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    If you want a simple easy to maintain pond, I'd strongly recommend firstly that you install a bottom drain. Without one, you'll constantly get muck build up on the pond floor and will require you to vac the pond out 1/2 times a year.

    In my view not installing a bottom drain would be the first mistake you'd be making.

    I get that you are worried about it leaking. Pretty much everyone is when installing them - I certainly was. But I don't think that's a reason not to install one. Instead you should use pressure pipe and make sure you glue it all together correctly I e. Wipe the ends with acetone before adding the solvent glue, then test the pipework out before moving on.

    A pond of that size would really need 2 bottom drains.

    If you are worried about leaks, I would recommend going for a fibre glass liner. It's more expensive than a plastic/rubber pond liner, but it is generally more durable and hard-wearing than a pond liner. However if fibreglass is too expensive, then your next best option be a box weld liner.

    I'd personally not go for pressure filters either.

    In my view they are a hang over from when pond filters were based on swimming pool filters. I think they are great for removing fines, but the problem in my view is that they are energy intensive compared to gravity flow filters. So they cost more to run in the long run. If you really wanted one, an option you have is to have gravity filtration on the bottom drains and a pressure filter of some type on the skimmer?

    Ps you really want to install a skimmer, to keep the pond water looking clear.

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    Last edited by Twhitenosugar; 13-05-2024 at 10:39 PM.
    13,000L fibreglassed raised pond with window

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  10. #6
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    In terms of the UV, that will only kill off the free floating algae cells I.e. The algae that turns the water green. It won't kill off the sting algae/blanket weed, as it can only kill off the cells which can float past the UV bulb and get zapped by the UV radiation.

    To keep blanket weed down you need to keep your nitrates and phosphates down. So plenty of water changes should help with that. Also if you have any plants in the pond, they would absorbe some of the nitrates and phosphates created from the fish food/waste.

    The other thing to consider is creating partial shade for the pond.

    I built a pergola over my pond and put some multi wall polycarbonate panels in (the stuff you maybe have seen as roofing on conservatories). Others have put up shade sails over there ponds.

    This has worked a treat on my pond and I have never had to treat (I hope I don't jinx it) for blanket weed once since the pond was up and running in 2019. I reckon building the pergola will probably be cheaper for me in the long run, than forking out for weed treatments every year.

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    Last edited by Twhitenosugar; 13-05-2024 at 11:02 PM.
    13,000L fibreglassed raised pond with window

  11. #7
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    The other thing I'd recommend is (if going with bottom drains) to T off your bottom drain pipe work and install a purge line e.g. The pipe goes to a drain via a ball valve.

    I found this was the single best feature of my pond (maintenance/filtration wise). And I only added it in at the last minute thanks to advice on this forum.

    The reality is even with bottom drains, they will be the dirtiest part of the pond and will probably always have some crap settled out in the pipework. And I find the sudden fast flow created when you dump some water via the purge line/valve is the easiest way to remove the muck in the bottom drain pipework.

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  13. #8
    Senior Member Rank = Adult Champion Alburglar's Avatar
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    A lot has been covered here already, but if you want Koi, it is possible to run pump fed, but you will regret not going down the gravity fed bottom drain route within your first year.
    The best way to explain that is:
    Koi get big. The size of a dog. Imagine trying to filter out 12 dog poos that have been through a blender ( your pump). In a gravity fed system the pump is after the filter, so it takes the poos out whole.

    You will regret a pressurized filter immediately (within a month of your first summer) because they are expensive and do not work well.
    For a 20,000 litre pond You should consider a nexus filter if a drum seems complicated or cost prohibitive. Look into sieves too.
    If you want to build this pond once, and not have to redo it, then please Don't do anything other than those three options unless you're going to do a DiY version of one of those three options.
    Nexus
    Sieve with moving bed (or Anoxic)
    Drum with moving bed (or Anoxic)

    You can add a standalone UV to any of these systems.

    Read through the pond build section and learn from our mistakes. Enjoy.
    Last edited by Alburglar; 15-05-2024 at 10:15 AM.
    2660 Gallons. 4" Bottom Drain and Skimmer. Draco Solum 16 Drum. Anoxic Filtration. Air lift returns.

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    Senior Member Rank = Yonsai ABN67's Avatar
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    Quoted from above post
    The best way to explain that is:
    Koi get big. This size of a dog. Imagine trying to filter out 12 dog poos that have been through a blender ( your pump). In a gravity fed system the pump is after the filter, so it takes the poos out whole.

    This is the best explanation ever for getting bottom drain(s)

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  17. #10
    Extreme Koi Member Rank = Jussai Scamp's Avatar
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    Hi I agree with all the above. I have 16000 lites one bottom drain. Providing you do your research and use right materials they are worth their weight in gold in terms pond cleanliness. A purge is good as a T-off via a ball valve. Skimmer also worth having, you can always add an Easy Pod to that line as extra filtration. On my pond I have a Nexus 320 but after 3 years of use, decided to go for a drop in Draco Drum for the mechanical side - has transformed the pond clarity and also reduced maintenance right down. Honestly we have all made mistakes that afterwards can cost a fortune. For me Brick Built / Fibreglass / Bottom Drain / Drum+Bio /variable speed pump and a correctly sized UV would be my recommendation - but recognise everyone has different priorities and budgets. Good luck with the build!

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  19. #11
    Iím with TWhiteNoSugar on all that advice. Donít be scared by bottom drains, with the correct sealant - which we can help you with - itís not a problem. And the dog poo analogy above is very trueÖ


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  21. #12
    Thanks I hadn’t thought of that… In which case maybe we should get a professional to install the pond after all?

    After a few losses from egrets we installed a wire surround with bells and plastic web thingys. We also have a pair of visiting ducks who keep trying to squat in the pond so now in addition to everything else we have a pair of plastic swans . It looks hideous but the fish seem safe now but our problems have continued as they are now breeding like rabbits and I cannot bring myself to get rid of them. We think we have about 30 fish now and we will try to catch them to take with us when we move. I have cut back on the amount I feed them but how do i stop them from breeding? 30 plus dog sized fish are a little concerning to say the least.

  22. #13
    Quote Originally Posted by Fionakevin View Post
    Thanks I hadnít thought of thatÖ In which case maybe we should get a professional to install the pond after all?

    After a few losses from egrets we installed a wire surround with bells and plastic web thingys. We also have a pair of visiting ducks who keep trying to squat in the pond so now in addition to everything else we have a pair of plastic swans . It looks hideous but the fish seem safe now but our problems have continued as they are now breeding like rabbits and I cannot bring myself to get rid of them. We think we have about 30 fish now and we will try to catch them to take with us when we move. I have cut back on the amount I feed them but how do i stop them from breeding? 30 plus dog sized fish are a little concerning to say the least.
    Not sure there is a way to stop them breeding. If they are all in the same pond are the adults not just eating the fry? I wouldnít have thought many, if any, will survive into adulthood unless thereís significant hiding places. If there is, you can remove the hiding places and the other fish will just eat all of the eggs and no fry to worry about.

    I donít think k you need a professional to do it. Itís perfectly feasible to do it yourself, even with bottom drains. Plenty of assistance on YouTube


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