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Thread: Clear water

  1. #21
    Junior Member Rank = Tosai Joe.n's Avatar
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    Thanks you are probably correct some of the pipe runs are 15 to 20 m long. I am going to try some things tomorrow and see what happens.

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  3. #22
    Quote Originally Posted by Joe.n View Post
    Thanks you are probably correct some of the pipe runs are 15 to 20 m long. I am going to try some things tomorrow and see what happens.
    Well that's an even bigger issue if I increase my Cetus sieve return to the pond by 3 meters to the far side of the pond running 50 mm pipe the flow half's and the Cetus just fills up, nevermind if your trying to pump that distance , you would need a few horse power pump to cover that distance even on 4 inch pipe , I've just changed my set up round and from drains to filter in-lets is less than 2 feet and the drains are working better than ever

    Sent from my HTC U11 using Tapatalk

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  5. #23
    Junior Member Rank = Tosai Joe.n's Avatar
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    They are gravity drains to drum filters to gravity nexus then pump to vortex.

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  7. #24
    Senior Member Rank = Grand Champion andikoi's Avatar
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    what make of drums are they,drums were made to pull water through quicker,personally i would take the easy out of the centre of each nexus to allow better flow,and really the nexus after a drum shouldnt need cleaning,unless your drum is letting stuff through,,,andi

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  9. #25
    Junior Member Rank = Tosai Joe.n's Avatar
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    Hello Andi, AEM drums. The centre of the Nexus is collecting some fines, with the centre of the nexus removed the flow rate did not improve. The flow rate could possibly be improved by enlarging the centre hole however I would not want to do this! The very fine stuff goes through the drum I am trying pond clay and have put some in today. Regards, Joe.

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  11. #26
    Senior Member Rank = Grand Champion andikoi's Avatar
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    well the aem drums can cope with 20,000lph but nexus 300 is only good for 13,000lph,i think your pulling too much through nexus,they work better with a slower flow to catch fines,you could as said see if your drum screens can be changed to a smaller micron although they are 70m standard,could it be that your pulling rubbish from top pond and stream into main pond,,,,,andi

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  13. #27
    Junior Member Rank = Tosai Joe.n's Avatar
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    Hello Andi, Thank you, I am going to try some changes to morrow and see how I get on. Regards, Joe.

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  15. #28
    Quote Originally Posted by Handy Kenny View Post
    Joe.n,

    I have an issue with my pond where the aerated bottom drain (at 7.5 feet) throws up a lot of the stuff heading towards the drain itself, the bottom of my pond is not flat but at a fairly steep angle. I helped out a bit by reducing the air flow to the bottom drain. I also use Koi clay which has the effect of binding fines together and helping them sink to the bottom, another effect that the koi clay has is to stick to the inside of the drum (along with any other waxy detritus) and inadvertently reduce the flow (slightly) through your drum mesh since the mesh size is reduced, catching even more fines. So counter-intuitively turning things back a notch may help.

    Kenny
    I had clarity issues when using aerated retrofit bottom drain few years ago - but than I came across one video at modenn koi blog by Martin Kamerrer couple years ago - focusing on benefit of tangential flow / current in the koi pond - contrary to general believe with aerated bottom drain as best solution - I cannot locate that video anymore - but this link shows the principle even better - https://www.youtube.com/watch?time_c...&v=Gtmf4y1e8C4

    water returns are angled in one direction to create current circulation around pond - with freshly filtered water replacing the water in the pond in layers from the top - and gradually pushing all the water with debris and fines down to the bottom drain - no aeration on the bottom drain as this only keeps the fines in suspension - preventing it being sucked down the bottom drain. As for aeration there is air stone placed in the corner and deflector plate installed so, that the air bubbles create airlift effect - the deflector plate directing it so it aids water circulation in the same direction as created by the returns from filters. In this video it is welded to the pond wall - as it is PE welded pond - but it can be also fixed from the top across the pond corner - dimensions - 40 cm long and 30 cm deep is enough to create this effect and really good current in the pond.

    Just food for thought - one comment on nexus - my pond water clarity improved radically after I have removed Nexus and EazyPod and replaced it with drum and DIY filters .... further improved than with installation of the deflector plate and air stone in corner with aeration switched off on the bottom drain....

    Good luck.
    You get what you pay for - or better - what you make yourself.

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  17. #29
    Quote Originally Posted by Joe.n View Post
    I started building this pond in August 2016 finally got to stage of it all working however I have fines in the water and am struggling to clear them. Any thoughts?

    Attachment 28363
    Magnificent view and equally nice pond - well done!
    You get what you pay for - or better - what you make yourself.

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  19. #30
    Senior Member Rank = Grand Champion andikoi's Avatar
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    just had an idea on this,how big are your vortex chambers,you could take the nexus out and convert your vortex's to bio chambers using the nexus k1 and sell the nexus on empty,,,,andi

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  21. #31
    Junior Member Rank = Tosai Joe.n's Avatar
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    Hello Andi, I am looking at the pond today, I have increased the water flow and will post about my progress later.

    I am coming to the same conclusion that it is probably best to remove the Nexus from the line, the vortex are 1m diameter and about 1.2m tall.

    Regards,

    Joe.

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  23. #32
    Senior Member Rank = Grand Champion andikoi's Avatar
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    those vortex would be ideal as bio chambers,and i bet would handle a good flow easily,,,,andi

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  25. #33
    Junior Member Rank = Tosai Joe.n's Avatar
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    Hello Andi,

    I set up one of the vortex this am and attached a 20000 lhr pump image attached:
    1.jpg

    I have disconnected one of the nexus and connected a 20000 ltr pump and the flow is much improved. On Friday I will look at connecting it to a vortex.

    Thank you for your help.

    Regards,

    Joe.

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  27. #34
    Junior Member Rank = Tosai Joe.n's Avatar
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    Thank you and greetings.

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  29. #35
    Junior Member Rank = Tosai Joe.n's Avatar
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    Thank you for the information, I will try and have a look later time disappears with ponds.

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  31. #36
    Junior Member Rank = Tosai Joe.n's Avatar
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    Hello All, Firstly thank you for all your replies I am now turning over approx. 16000gph as usual a few issues getting there. I have an EVO75 uv and I noticed that the water flow did not increase when I change the pump further the bulb was blown and the crystal sleeve or seal was letting water into the bulb area, some corrosion on one of the bulb sockets.

    Any thoughts on what is a good UV with full flow please.

    Also am thinking of a clarity CL10 has anyone any experience with these please.

    Regards,

    Joe.

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  33. #37
    Senior Member Rank = Grand Champion andikoi's Avatar
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    TMC uvs ive always used and never had issues,as long as you change the O-rings every year when you change bulb,for the sake of a few pence its worth doing,,,,andi

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  35. #38
    Junior Member Rank = Tosai Joe.n's Avatar
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    Thanks Andi, BTW I have removed all nexus for the filter system and am converting vortex to bio filters brill idea thank you. Joe

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  37. #39
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    nice one,and you can sell the nexus and get some cash back lol,,,,andi

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  39. #40
    Junior Member Rank = Tosai Joe.n's Avatar
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    I will keep them they may come in useful? as a garden planter maybe?

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