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  1. #1
    Junior Member Rank = Fry cris1973's Avatar
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    Newbie with question about bottom drain.

    Hi,

    I have just moved house and starting to plan out our new pond, our previous pond was pump fed into a kockney 5000 filter and now i want to go gravity fed, the pond will be roughly 6' deep and fed into hopefully a nexus 220 filter and return via a water blade or a return below water level (haven't made my mind up on this yet). The filter will be housed in a shed along side the pond with the water level in the filter the same as the pond. There will be a pump after the filter going into a UV light then return to pond.

    My question is..... If there is an major leak anywhere on the system would the pond totally empty itself or would it stop pumping if the water level got to a certain level eg the water level fell below the level of the filter system?

    Any advice appreciated..

    Sorry if it sounds a dumb question


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  2. #2
    Depends on where the leak occurred, If the bottom drain failed then that being the lowest level, the pond would totally empty.

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  4. #3
    Sorry, forgot to say, welcome to the forum

  5. #4
    Unless there is a huge leak in the bottom drain then there will always be water in the pond up to the level of the bottom of the filter.

    Eventually the pump would run dry and stop pumping water.

    This is better than emptying fully and losing the fish which can happen on a pump fed system .

    Sent from my SM-A516B using Tapatalk

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  7. #5
    Ps. Neat drawings .

    Sent from my SM-A516B using Tapatalk

  8. #6
    Junior Member Rank = Fry cris1973's Avatar
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    Many thanks for the welcome, hopefully i wont suffer from a bottom drain problem, is there anything I should pay attention to when putting in the bottom drain so i steer clear of having problems??

  9. #7
    Junior Member Rank = Fry cris1973's Avatar
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    Thats the thought i had in my head but thought i'd ask the question to make sure my theory was right, lol thanks I pinched it from Nexus website cough cough

  10. #8
    Quote Originally Posted by cris1973 View Post
    Many thanks for the welcome, hopefully i wont suffer from a bottom drain problem, is there anything I should pay attention to when putting in the bottom drain so i steer clear of having problems??
    Are you intending for a concrete brick built pond or liner ?

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  11. #9
    Junior Member Rank = Fry cris1973's Avatar
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    I'll be doing a concrete base and block work sides.

    I've been looking at fiberglassing and is coming out a bit too expensive for me, is there another way of costing sides after the render mix on the concrete??

    Sent from my SM-A705FN using Tapatalk

  12. #10
    Thats the way to go. I've almost finished mine . Concrete slab , hollow blocks , back filled.
    Fibreglass with window. Approx 2500 gallons.

    Will pm you re cost of fibreglass.

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  13. #11
    Try Ken Alexander who’s well thought of on here or Dave Arnold for fibreglassing. While it’s a bit more expensive than liner you’ll never regret glass.

    Might want to insulate rather than render walls? I also did the pond floor on mine but with hindsight shouldn’t have bothered

  14. #12
    Senior Member Rank = Nanasai Spongebob's Avatar
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    Beg, steal, borrow, but make sure you fiberglass, seriously its the biggest mistake you will ever make if you dont. The only reason not to would be a massive pond where its not viable. If you are going to the expense of concrete base and blockwork then fibreglass! Simples.
    9000 litre, fibreglass, BD/skimmer, Nexus 220, Draco, Remora i9 ASHP, Econbead 50 bead filter.

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  16. #13
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    I didn't glass and wish I had. If you can't glass then box weld liner I'd the next best thing

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    Johnathan

  17. #14
    I didn’t think it was massively more expensive to glass, lot easier putting in drains, returns etc. and certainly easier to stop crud getting caught in folds, ridges which has to save a fortune in aggro further down the line

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