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  1. #21
    Senior Member Rank = Jussai Djstiles999's Avatar
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    The QK drums look rather nice so the challenge is to get the bio volume and as importantly the time of water in contact with it right. The Combi option doesn’t seem that appealing as I can’t see how you can hold the water contact long enough unless I’m really missing something? I was aiming for 5 minutes in K1 contact?

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  3. #22
    Senior Member Rank = Grand Champion andikoi's Avatar
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    to get 5 mins water contact time you would need a really slow flow in a really long huge chamber,think the idea with contact or dwell time now is that the quicker you put the water through the more times the good bio can do its job,plus with a drum in front its only minute stuff that gets through,andi

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  5. #23
    Senior Member Rank = Jussai Djstiles999's Avatar
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    I was in the big box space and doing some maths, scarey numbers! In my head I’m think of a 1.5 hour turnover which is around 45,000 litres. The drums I’ve looked at could handle that quite easily. Liking the block built bio filter idea and have 250 litres of K1 in the garage ready to use so no budget impact. The answer possibly is to run a second filter type such as a shower. Love the planning, useful to have had so many comments to mull over so thank you one and all

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  7. #24
    Senior Member Rank = Grand Champion andikoi's Avatar
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    have you checked the price of a purpose built bio chamber from say evolve or jbr against your block built,if you go block built how will you make it waterproof,think bricks,cement,liner or fiberglass all costs,just a further thought for you,also remember the quicker water going into drum the quicker it will get dirty and the more it will need to clean,andi

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  9. #25
    Senior Member Rank = Jussai Djstiles999's Avatar
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    The key costs to a block filter is the fibreglassing. K1 retention could be be buying the evolve mesh boxes potentially or by using stainless mesh sheet. At worst you’ve got £300 of fibreglass, rendering and £100 for some smaller bottom drains and pipe work to get crud out and about £250 for mesh. The evolve boxes are £850 to hold 100-150 litres or next box up is £1k. I couldn’t find JBR but assume they'd be similar? If I block build as noted I can build to the full size of space available and to some degree shape (if that makes sense) so would expect a dramatically increased capacity? Probably need to get the tape measure out again at the weekend!

    Maybe I should have held onto the 4 old Hydra units I had that were quite happily running K1 on my last pond

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  11. #26
    Senior Member Rank = Grand Champion andikoi's Avatar
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    wonder what deal you could get for 2 of these with option 4, gives you everything you need,2 seperate drums with 40w amalgam uv in each and bio chambers,including high pressure pump and pipework,and airpump and airline and 75liters of helix media per bio chamber,plus connectors,works out at £3438, i think thats a good deal,so 1 on each bottom drain although they have 2 x 4" inlets so 4 bds could be fitted or 3 and a skimmer line,especially as with 2 if anything goes wrong you still have 1 setup running still,thats what i like with mine,i have 2 in case i need to shut one down ive still got water going through,andi https://www.ebay.co.uk/itm/Koi-pond-...3b0e%7Ciid%3A1

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  13. #27
    Senior Member Rank = Grand Champion andikoi's Avatar
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    also with the ones i posted you could stick 125 liters of your k1 in each so giving 400lts of media,andi

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  15. #28
    Senior Member Rank = Jussai Djstiles999's Avatar
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    Funnily enough I’d seen these, look incredible value!

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  17. #29
    Senior Member Rank = Grand Champion andikoi's Avatar
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    i like the idea of having a backup running by having 2 sets,and all you would need extra is the pumps which i would go variable so you can mess with flow,andi

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  19. #30
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    How about an Ibc tank for the Bio,a few have used these and can be picked up cheap either 1000 or 600 litre.
    John

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  21. #31
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    The concern I have with these is that they have only 1 x 4" connector to the bio. My experience is if you don't want a significant drop in water height between drum and bio then you cant run more than 10 to 12k ltrs through a single gravity fed 4" connection. The reason a drop in level is undesirable is that it reduces the effective bio chamber size and capacity - so the more flow you try and put through the bio-chamber the less media you can have in it!

    The 20,000ltr max flow for these units would only be achieved if a big pump is fitted directly to the filter. You would then pump up to a shower or a bio chamber that gravity feeds down to the pond. I believe people have modified these drum units to have 2x 4" outflows which would make the full 20k flow possible.. The capacity of the bio chambers is inefficient for your size pond imo. A couple of 1000ltr IBCs would be much better.
    6000g in ground koi pond
    +3000g lily/Anoxic pond attached
    29 koi (40 to 65cm)
    Bottom drain, Mid water & Skimmer to Drum
    JBR boichamber->Blue eco 500 pump ->below surface return.
    Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)

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  23. #32
    Senior Member Rank = Grand Champion andikoi's Avatar
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    I dont think these are undersized for ops pond.not with 2 drums running and as for bio,personally i dont think we need the massive amounts we used to do,the op did say something about putting a shower on so this plus 250lts k1 and 150 lts helix i think would be ideal. Andi

  24. #33
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Quote Originally Posted by andikoi View Post
    I dont think these are undersized for ops pond.not with 2 drums running and as for bio,personally i dont think we need the massive amounts we used to do,the op did say something about putting a shower on so this plus 250lts k1 and 150 lts helix i think would be ideal. Andi
    If he is still talking about 13,000 gallons just under 60,000ltrs I think not. I would be surprised if you could draw 15,000 ltrs through those units and even if he could then it gives a pond turnover of only once in two hrs! Not good enough mechanically in my opinion. I don't know what fish load the op is looking at but we have to assume he will eventually want a fish /1000 ltrs - that's 60 fish!! - I have less than half that and a lot more media than you are talking about, and I am still restricted on what I can feed. I stick with my suggestion of 500ltrs to start and another 500ltrs as the fish grow + showers too probably!
    6000g in ground koi pond
    +3000g lily/Anoxic pond attached
    29 koi (40 to 65cm)
    Bottom drain, Mid water & Skimmer to Drum
    JBR boichamber->Blue eco 500 pump ->below surface return.
    Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)

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  26. #34
    Senior Member Rank = Grand Champion andikoi's Avatar
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    I still think we should be going for 2hr turnovers.this getting your water volume turned over as quick as possible i dont personally think does any good,the bio doesnt get chance to grab anything,25ltr of helix 13 is supposed to be able to cope with 170g of food so in ops case with 75lts per chamber thats 1kg of food which i doubt he will get near to doing,plus his 250lts of k1 and maybe a shower thats a huge bio mass.it is just my opinion though,maybe op needs to see some filters running to get a better idea of what he wants...andi

  27. #35
    Senior Member Rank = Jussai Djstiles999's Avatar
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    https://rover.ebay.com/rover/0/0/0?m...2F322911946379

    2 110mm returns and oook suspiciously like the AEM kit?

  28. #36
    Another vote here for an IBC as a bio tank. Cheap and easy to do!

    See pics of mine. I just dropped a load of air stones in it, works really well.

    The only mod I have added it to change the push fit drain stoppers shown with the flexible rubber boot end caps with the jubilee clamp on.
    Attached Images Attached Images

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  30. #37
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Like it Garry,did you use K1?
    Is pic 3 the inlet and the slots outlet?
    I don't know why others don't use them as they are cheap and easy to convert.
    John

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  32. #38
    Yes, I have between 400 to 500 litres of K1 in it.
    I drilled holes in the brown pipe and then wrapped in a plastic mesh over the holes, held in place by cable ties.
    Both of the brown 'T' pieces are the same, one for inlet and one for outlet.

    Hopefully this pic is clearer
    Attached Images Attached Images

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  34. #39
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Great idea Garry,like it.
    John

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  36. #40
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    Quote Originally Posted by Djstiles999 View Post
    https://rover.ebay.com/rover/0/0/0?m...2F322911946379

    2 110mm returns and oook suspiciously like the AEM kit?
    I think the issue is that in the standard setup one of the 2 outputs is taken up by the amalgam UV. I have never seen one in the flesh though - perhaps someone who has can comment further.

    They are very cost effective little drums and available elsewhere at under a grand. If you can afford it though the QK50 is really nice. The Aqua Drum 55 is lovely to - it comes with an integral pressure pump which is a nice touch but it does cost that bit more.
    6000g in ground koi pond
    +3000g lily/Anoxic pond attached
    29 koi (40 to 65cm)
    Bottom drain, Mid water & Skimmer to Drum
    JBR boichamber->Blue eco 500 pump ->below surface return.
    Blue Eco 240 -> Large MB -> Waterfall -> Planted Anoxic pond (25 baskets)

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