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  1. #1

    40000 Gallon Pond

    Looking at finishing this off next year I've taken over this pond which has been "in progress?" For the last 20 years I put it between 35 and 55000 gallons. I've done a fair bit of research but can't find anything much of this size and was hoping to get some advice on how to tackle this renovation. Number one fibreglass or paint. Number 2 is filtration cieve drums and bake showers or a multi bay setup and number 3 is how do I plumb it in the planned filter bays(concrete block) used to be about 30x8 feet out the back of the koi house but they were filled in so the pipes don't go anywhere now for the eagle eyed among you. number 4 is what size concrete slab and how do I control the water ingress. The rough dimensions are 40x20 outside and 10x15 inside


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  3. #2
    Senior Member Rank = Yonsai Liam77's Avatar
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    Hi Jack, that could look amazing one day...got a lot of work on your hands!!! Firstly I am assuming it’s going to be 55000 litres and not gallons. That will make a big difference. Filters, from the research I have done will point you towards a drum running your bottom drains and maybe even 1 on each BD. I think you will want to run a shower or 2 as this will dramatically increase your filtration requirements for a lot less money and it will complete the nitrogen cycle. I’d maybe even think of something like an easy pod running from the skimmers. As far as your pond finish I’d definitley go for fibreglass for longevity. Doing both of these things will dramatically decrease the amount of time you will need to spend cleaning and repairing in the future. The plumbing side of things will come the more you read and see on here, take out of it what applies to what you want and the way you want to do things. Everyone’s pond is different and so are the budgets. It all comes down to taking out the important stuff and deciding for yourself what you want and then you will start to understand your setup more rather than listening to a vast amount of views which may or may not work for you. Saying that, I hope I haven’t confused you even more. Good luck

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  5. #3
    Senior Member Rank = Grand Champion RoyLittle0's Avatar
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    With it being a renovation and you don't know what is behind the walls, how thick they are, slab thickness, then it would have to be fiberglass, as for filtration it will depend on what you are keeping, koi do need more filtration than goldfish

    I assume your measurements are in feet?
    Gallons or litres?
    Does it have a bottom drain?
    Are there any returns?
    What pipe has been used?
    What base does it have at the moment?
    what are the blocks sitting on and are they just single skin?

    basically we need a bit more information to give you a better answer

    Filtration will also depend on budget, Koi keeping can be verrrrry expensive

    Concrete slab will be around 6 to 8 inches, dependent on sub soil

    It certainly looks a nice project and 40,000 gallons is one hell of a pond
    Last edited by RoyLittle0; 16-08-2018 at 07:30 PM.
    4600 Gallon Concrete Block and Fiberglass
    2100 mm x 710 mm Infinity Window 32mm thick glass
    2 x Aerated Bottom Drains and Skimmer
    Filtreau HiFlow 30 Drum Filter
    Bio Chamber - 140 litres K1
    Bakki Shower - 30 KG Sakura Far Infrared Media
    2 x 18,000 lh pumps
    Heated from house boiler through a heat exchanger
    Idealseal MS290

    My Pond Build

  6. #4
    Thanks and no I'm pretty sure it's gallons but that was just rough figures in the calculator. I was thinking 3 bottom drains with 2 filters. And then a skimmer with an easy pod is a good idea I never thought of doing that. Thankyou for the rest of your advice also

  7. #5
    Okay so abit of history it was never made into a working pond as can be seen and has never "run" it was started by my dad who moved over from Ireland and wanted to bring his fish with him, he won the all Irish in the 90's sometime. Anyway he built an indoor pond and then started on this outdoor one but it was never finished. It's just concrete blocks (single)on the side and the original depth was 8 feet but now sits at about 5. As far as plumbing goes there is nothing there no bottom drains or pipes returns , they all got buried when the pond was made shallower over the years. And the measurements are in feet

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  9. #6
    The current base is type 1 substrate on top of concrete blocks and other rubble from other projects

  10. #7
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
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    40000 Gallon Pond

    That’s certainly a Project Jack - great to see someone coming along & wanting to ‘save’ a pond (appreciate its your Dads).

    Get it empty and cleaned out and let’s have a look at it!

    In all seriousness I’d get a budget together & see what that dictates.

    Liam has outlined a good option filtration wise above, you can always address that again when you’ve understand what your looking at build wise; bottom drains, pipe runs, concrete (base, blocks, etc.) diamond core drills for returns, any rebuild of areas/strengthening - you’ll have a big list before you even get to the fibreglass/finish stage.

    Roy’s points about checking the integrity of it all are also key.

    Rob.


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    Last edited by RJW2012; 16-08-2018 at 08:58 PM.

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  12. #8
    As it's dads it's dads wallet too�� It won't start until the spring next year but I just wanted as many opinions as possible, as far as checking integrity do I just ask the old man? Or is there an actual way of testing.

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  14. #9
    Quote Originally Posted by Jack23 View Post
    Thanks and no I'm pretty sure it's gallons but that was just rough figures in the calculator. I was thinking 3 bottom drains with 2 filters. And then a skimmer with an easy pod is a good idea I never thought of doing that. Thankyou for the rest of your advice also
    Hi,
    Looks an exciting project. I would advise checking your volume calculations and sharing on forum before designing filtration. From your photos, the pond looks roughly the size of the main pond at absolute koi which is c. 12,000 gallons (or c. 55,000 litres).

    A 55,000 gallon pond would be 250,000 litres. In essence, this would equate to a pond 20m long by 5m wide by 2.5m deep!
    Ian.
    Last edited by imc28; 16-08-2018 at 08:43 PM.

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  16. #10
    Extreme Koi Member Rank = Jussai RJW2012's Avatar
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    40000 Gallon Pond

    Quote Originally Posted by Jack23 View Post
    as far as checking integrity do I just ask the old man? Or is there an actual way of testing.
    If your Dad’s a Builder or Structural Engineer i’d go with Dad - if he’s anything like me I’d get a 2nd opinion!

    Visually checking everything is a good start, measuring wall thickness, examining the joints, even so far as giving everything a good hefty poke.

    I’d probably also say why not get a few ‘specialists’ in for a chat and quote. Have you got any local pond landscapers/builders near you; see what they say - a cuppa and some biscuits will get you a long way.

    Great Project for you and your Dad as I say.

    Rob.




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  17. #11
    Hah no he is by no means a structural engineer, a national account manager for a drainage firm though so that may come in handy �� There are quite Afew pond "specialists" in my area I could have a ring round and see if any would do a quote and advice. I've given everything a good poke and it's pretty solid I must say the only problems are the 2" inlets or outlets. They seem abit weak.

    okay I'll do the pond measurements later and get back to everyone to see if anyone can give m a figure. With it being a kidney shape with the rectangle attached and the island in the centre it's quite a difficult one but 55000 gallons is way off. I prefer the idea of 55000 litres it's much more manageable with filtration.

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