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  1. #1

    Gravity fed bottom drain and filter query

    Hi, I am brand new to ponds - I have kept a 300 litre marine tank previously and now fancy a change and as my dad used to keep a massive koi pond, i am looking at a smaller scale version.

    All i know at the moment is that it will be approximately 2000 gallons and i want a bottom drain with a gravity fed filter. I have been looking at filters today and a recurring product is the nexus 220. But i also saw a product called dracodrum.

    Am i right in thinking that the dracodrum is something you would buy in addition to a filter? If so I will leave that to one side and concentrate on the filter, the one i am looking at is the nexus eazy 220. Does anyone have any opinions on this and in principle would it be suitable?

    Thanks in advance,

    Ben



  2. #2
    Senior Member Rank = Jussai Twhitenosugar's Avatar
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    Hi Ben. Welcome.

    With filters you have mechanical filtration (to remove solids and particles) and biological filtration (to break ammonia down - although I'm guessing you know all about that).

    The Draco drum is just a mechanical filter, so you will need a biogical filter after it (such as a moving bed filter, shower filter etc).

    Drums are generally seen as the best type of mechanical filters as they are self cleaning. But they are pricey.

    The Nexus is a combo of mechanical and biological all in one filter. There's pros and cons to them, I understand one criticism of it is it still allows fine to get through.

    It's probably best to get opinions from people who have one for feedback, as I've not used one.

    I do have a Draco drum and think it is good. But they only handle about 60% of the flow stated by the manufacturer. So worth bearing that in mind.



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    13,000L fibreglassed raised pond with window

  3. #3
    Cheers for that. Yes it seemed like you needed something else as well as the dracodrum when I was researching it but couldnít find it explicitly written anywhere. Iím open to other filters, I just donít enough about them at the moment so will continue to research and maybe visit some retailers to chat to people. Thanks


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  4. #4
    Senior Member Rank = Jussai Twhitenosugar's Avatar
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    All you need is a moving bed filter for bio. You can make one yourself easy enough.

    All you need is a water proof container that has an inlet from the drum and out let (that won't let the media out) to the pump. Then chuck the media in (Kaldnes K1, Oase Helix 13 etc...) And a few air stones to get it all bubbling over and Bob's your uncle.

    Many people use an IBC tank for this.

    When sizing the tank,you just need to remember that you can only fill it with a max of 60% media to water (e.g. If your tank holds 100l of water, you can only get 60litres of media in it).

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  5. #5
    So buy a drum for mechanical (such as the dracodrum) and then make your own bio? Seems reasonable. Although as Iím learning so much all as a novice (including how to build the damn pond on another thread Gravity fed bottom drain and filter query) I might go for a purchasable solution this time. But more to think about thank you


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  6. #6
    Extreme Koi Member Rank = Jussai NickK-UK's Avatar
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    Quote Originally Posted by Benallen2000 View Post
    So buy a drum for mechanical (such as the dracodrum) and then make your own bio? Seems reasonable. Although as I’m learning so much all as a novice (including how to build the damn pond on another thread Gravity fed bottom drain and filter query) I might go for a purchasable solution this time. But more to think about thank you
    Don't worry - there's a lot of expertise in design and building. Better to ask questions now during design than later once it's built!
    1700 litres on 50 watts
    Eco Pond 2.0: 13,000 litres, 58W airlifts, 1300l anoxic, Solum 16. No pump.

  7. #7
    Extreme Koi Member Rank = Jussai NickK-UK's Avatar
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    Quote Originally Posted by Benallen2000 View Post
    So buy a drum for mechanical (such as the dracodrum) and then make your own bio? Seems reasonable. Although as I’m learning so much all as a novice (including how to build the damn pond on another thread Gravity fed bottom drain and filter query) I might go for a purchasable solution this time. But more to think about thank you

    The drum uses water and auto-triggers so don't forget the water supply, waste plumbing and power.

    I have a Draco solum16 and bio. Overall good performance although I would keep the controller box out of the rain (inside a separate shelter).
    1700 litres on 50 watts
    Eco Pond 2.0: 13,000 litres, 58W airlifts, 1300l anoxic, Solum 16. No pump.

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  9. #8
    Expensive but I purchased a Profi clear compact that combines drum and moving bed.
    Clarity unbelievable, readings now excellent, had a bit of NPS combined with overfeeding as you do at the start !!

    Have a thread on the pond build section.

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