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  1. #1

    How frequently should your pond cycle

    My pond is very small compared to most on here so small in fact I'm talking 1,500 litres.
    I will go bigger at some point but just haven't got the space at the moment.
    I think I've got it set up pretty well for what it is and on a very small budget tbh.
    It's vastly over filtered which is bound to be the reason it copes with too many fish for its size and still allows them to grow when looking at the size of the pond you would think they wouldn't.

    I've read a lot about ideals for keeping koi like one foot of fish for 1000 litres of water and one cubic foot of medium for every 1000 litres of water etc but can't seem to find any info on water cycling.

    Lets say i purchased a filter and it recommends or states its rated for 5000 litres per hour.
    Or say your uv is rated for so many litres or gallons and it might suggest a max flow rate of 10,000 litres an hour or less.

    Is there any general rule of thumb for how frequently your total volume of water should complete a full filter cycle or how many full cycles should be achieved in an hour or a day?


    Last edited by Solvent Cement; 19-09-2019 at 06:39 PM.

  2. #2
    Senior Member Rank = Mature Champion Ajm's Avatar
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    Every one is different some aim for whole pond once a hour some do whole pond every 2 hours . With a smaller pond I would opt for once a hour as you need that fish waste out asap where on a larger pond it's more diluted if that makes sense. Imo

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  4. #3
    Senior Member Rank = Supreme Champion freddyboy's Avatar
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    Quote Originally Posted by Ajm View Post
    Every one is different some aim for whole pond once a hour some do whole pond every 2 hours . With a smaller pond I would opt for once a hour as you need that fish waste out asap where on a larger pond it's more diluted if that makes sense. Imo

    Sent from my SM-N950F using Tapatalk
    The rule of thumb is turnover of water one to 2 hours. Who s rule of thumb. I ain't got a clue.Mine 5000gal is one and a half hours. As AJ says different ponds and systems. What ever works I suppose.


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  6. #4
    Member Rank = Nisai MikeMack's Avatar
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    In my opinion it’s down to the filter and nothing else, your filter should always be able to cope with a flow that’s at least your ponds volume every hour.

    if your pond is 5000 litres and your filter can cope with 10000lph then turn it over at that, turning you pond over twice an hour.

    My pond is 17000L, I pull 40000lph through my filters, turning it over 2.3 times an hour, I’m tempted to change my shower pump and pull more through, if the shower can cope with the flow that is.

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  8. #5
    Quote Originally Posted by MikeMack View Post
    In my opinion it’s down to the filter and nothing else, your filter should always be able to cope with a flow that’s at least your ponds volume every hour.

    if your pond is 5000 litres and your filter can cope with 10000lph then turn it over at that, turning you pond over twice an hour.

    My pond is 17000L, I pull 40000lph through my filters, turning it over 2.3 times an hour, I’m tempted to change my shower pump and pull more through, if the shower can cope with the flow that is.
    40,000 litres per hour is some serious water flow.

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  10. #6
    Senior Member Rank = Gosai Sim's Avatar
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    I think what the others have said is a good bench but also you need a reasonable contact time with the media otherwise its point less.
    I think it should be at least 5mins off hand, so running high turn over is ok if the filter allows it.

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