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  1. #1

    Retro fit bottom drain.

    Hi, I'm thinking of installing an airated rbd.
    But I can't find many update/reviews on how they perform etc.
    Does anyone have one, how do you find it?
    Does it clear the crap as expected.
    I have a 17500 sub pump and would install 50mm sw pipe.
    Any info would be greatly appreciated.

    Sent from my SM-G991B using Tapatalk

  2. #2
    Senior Member Rank = Jussai Djstiles999's Avatar
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    Jan 2019
    Forest of Dean
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    I had one on a previous pond, I thought it was a useful addition, not as good as a standard bottom drain as you’re pumping rather than gravity feeding the filters. It will clear a fair bit of rubbish though, probably 4 ft pull effectively, not quite as effective as you get further out from that. My advise would be go for it
    13,243 gallons, Filtreau HF30ís K1 capacity of 1,400l, Bakki Shower, BHM and understanding wife

  3. Thanks Frimley Koi keeper Thanked / Liked this Post
  4. #3
    Retro fit bottom drain.

    Sent from my SM-G991B using Tapatalk

  5. #4
    Extreme Koi Member Rank = Supreme Champion Frimley Koi keeper's Avatar
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    Jun 2012
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    I had a standard retro BD and the only problem I had with it was blanket weed would block it if I didn't keep on top of the Aquasource Resolve treatments. Not planted, no shower or anoxic etc to remove the Nitrates and Phosphates just loads of static and moving bed K1 to add to the problem if you like. Ammonia and Nitrite were spot on.

    I think the previous set up was better at dealing with the blanket weed. Pump with cage. The blanket weed surrounded the cage and then the pump would chop it up to a degree. Don't get that with the retro BD as the pump is too far away to effectively deal with any of the blanket weed.

    My retro BD and pump pipework was fairly easy to remove from the pond to clean and remove the blanket weed. Not sure how much difference an aerated version would make if any?
    Last edited by Frimley Koi keeper; 15-09-2023 at 11:36 AM.
    All we ever wanted was everything,
    All we ever got was cold,
    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

  6. #5
    Been running non aerated one on my 5500 gal pond for about 13 years no issues and does the job

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  8. #6
    Senior Member Rank = Adult Champion Gazkoi's Avatar
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    Feb 2020
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    The definitely do the job however, keep and eye on blockages of heavy leaf fall or blanket week debris.

    Also they add a lot of equipment into the pond which can cause injuries from flashing etc.. and cause challenges when trying to net the koi.


    Hobby and business gone but when youíre hooked youíre hooked.

    Always happy to help!!

  9. Thanks Frimley Koi keeper Thanked / Liked this Post
  10. #7
    Never had a blockage in all the time I have used it,



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