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  1. #1

    Finally getting round to refurbing the pond.

    Finally refurbing the pond & stream.

    It's an inground pond liner with in pond pumps, think we've decided on 2xRetrofit bottom drains.

    Will be connecting up to a Nexus 320.

    A seperate pump will be running the stream, so ignore that for now.

    Pond is approx 4m x 3m x 1.5m (un

    A couple of questions....

    1) is it better to run 2 pumps, one for each BD, that'll then connect to the same run into the nexus, or just connect both BDs to one pump?

    2) which then brings me to pumps, thinking about trying to reduce amount of stuff in pond, was thinking of running dry mounted pumps in a below water level chamber, with the pipe exiting the pond through the liner below water level and a non-return valve before the pump, so when the pumps get turned off the pump will be "primed", is that possible or just keep it simple with the inpond pumps?

    3) Recommendations for said pumps, either in pond or dry mounted, I do have a Jebao TSP 30000 variable that I bought off here 2 years ago and still not used it, but that says it's 385w, so with cost of electricity, maybe best to get a new more economical one?

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  3. #2
    Senior Member Rank = Grand Champion samp09's Avatar
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    Have you thought about using airlifts?

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  5. #3
    Quote Originally Posted by samp09 View Post
    Have you thought about using airlifts?

    Have thought about those, they're just for aeration aren't they?

    Also easy to maintain for my 67 year old dad?

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    Last edited by CBKOI; 22-04-2022 at 04:38 PM.

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  7. #4
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    They're not just for aeration (although they do a good job of it).

    They're for pumping water in a gravity set up. I have one on my pond and it's the only pump I use on my pond now (I did have a conventional pond pump as well for a shower filter, but have turned that off for now).

    They're great for keeping running costs down. I use a 80lpm / 58watt air pump to supply air to both a moving bed filter and the air lift. An air lift only needs a 40lpm air pump, so super efficient.

    An airlift made out of 110mm waste pipe that is between 1.5m - 1.7m long/high with a 40lpm pump can probably pump around 20,000 lph, providing there aren't too many restrictions in the filters and pipework.

    To put this into perspective, when I first got my air lift up and running it was so powerful it was draining my filters down so my drum was constantly cleaning, so I had to dial back on the amount of air being fed into it i.e. diverted more air into the k1 filter.

    If you search for air lifts on this forum you'll find a few threads (I've written one) about how to build them.

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    Last edited by Twhitenosugar; 22-04-2022 at 07:51 PM.
    13,000L fibreglassed raised pond with window

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  9. #5
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    Also, there is no maintenance to them.

    The only moving part on an air lift is the air pump, so as long as that keeps ticking over (which are arguably more reliable than pond water pumps), you'll only have to worry about cleaning the pond filters.

    They really are awesome, but can be a bit of pain to retro fit, but not impossible.

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    Last edited by Twhitenosugar; 22-04-2022 at 07:48 PM.
    13,000L fibreglassed raised pond with window

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  11. #6
    Quote Originally Posted by Twhitenosugar View Post
    Also, there is no maintenance to them.

    The only moving part on an air lift is the air pump, so as long as that keeps ticking over (which are arguably more reliable than pond water pumps), you'll only have to worry about cleaning the pond filters.

    They really are awesome, but can be a bit of pain to retro fit, but not impossible.

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    Can they be used for a filter above pond level?
    Assuming not?

    EDIT - I see they can be put slightly above water level, so if the entry to the nexus is less than 12" above water level, could I maybe run one with a non-return valve on the mainline to the nexus?

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    Last edited by CBKOI; 22-04-2022 at 09:13 PM.

  12. #7
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    Technically they can pump above water level, but they are not very efficient when doing so and from what I have seen online, they don't deliver much water.

    So personally I only recommend using in a gravity set up, as I know that works well.

    I'm not sure they'd work with a no return valve before hand? To work effectively, they need to have as little resistance (both before and after the air lift) to maintain a good flow.

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    13,000L fibreglassed raised pond with window

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  14. #8
    Next question, decided on a float switch to have in the pond, are there any bloody black ones or can I paint?
    It's a bit lairy....

    https://www.ebay.co.uk/itm/334165948...mis&media=COPY

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