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  1. #1
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Nexus flow rates

    I know the nexus 200/210/220 have a maximum flow rate of 10000 L/P/H but I have an underwater return which makes the output difficult to measure. Any tips on what will happen if I exceed the limit, was thinking the outer chamber would be pump out and possibly the vortex may not allow solids to settle.
    Thanks
    Ian



  2. #2
    Member Rank = Sansai pfrosty's Avatar
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    The faster the flow through the filter the less time it has in the outer bio chamber for the bio to condition the water. Therefore the filter is getting less time to do the job its designed to do

  3. #3
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Thanks, I have doubled my flow rate from about 4000 L/P/H To 8000 approx, problem was that The nexus wasn’t pulling all the solids through the bottom drain; it’s much better now. I have put an Econobead 60 on after the nexus with 90 litres of K1 Micro and 20 litres of bead which will boost the bio side and hopefully catch the fines, could put a few more beads in and less K1 not quite sure of which ratio to go as I have approx 90L of K1 micro and 40l of bead, the Econobead has a capacity of 110L of media.
    Thanks
    Ian

  4. #4
    Senior Member Rank = Grand Champion andikoi's Avatar
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    8000lph is perfect for a nexus 200,,,,andi

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  6. #5
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Decided to put 25L of K1 micro in easy, about 50/50 split K1 micro and beads in Econobead.
    That in total 25L. K1 micro plus 100L K1 in bio of nexus. 105 litres media in bead. Spindrifter bottom drain.l
    1500 gal pond but heavily stocked all parameters fine

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  8. #6
    Ian, I run two nexus 320's on my pond and each one is fed by s 4" bottom drain and returns to the pond via a mid ish water return.

    I have two 10k pumps working at full tilt, but given the length on some of the pipework and the different bits the water has to pass through, heaters, UVs, valves, swept bends, etc, I think my flow rate is down around 8k.

    Now even at 8k I see my outer chamber lever drop around 2inches, and this is after a clean.

    I don't know what other factors play a part, but I personally would try to run your nexus on the slower side, not just to help retention rate, but to reduce fines. I think a fast flow through the Nexus either just sucks the waste through or actually churns it up.

    Jay

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  10. #7
    Senior Member Rank = Jussai Spongebob's Avatar
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    I’m only planning on 5000 max, for me less flow less issues...
    Fibreglassed/5000 gals/4.5 m Tunnel/Spindrifter/Twin drums/Bio chambers/Beads/Showers/Remora ASHP

  11. #8
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    I have ran mine at a lower limit approx 4000L and it would not pull the larger solids through the last 90deg bend, this was obvious to me because as soon as I purged the drain a load of solids come through, there wasn’t enough water coming clear for it to be nearer the drain.I do have some larger fish approx 10lb in weight, so quite large solids. Running at 8000 is pulling a lot more solids through. I am sure the bead will catch any fines fulled through.

  12. #9
    Hi Ian,

    I have the same issue with large solids, I've got to run my pumps past otherwise the solids just don't come up. My pond is 8ft deep, so the solids have to travel a long way up, and one of my pipe runs from bottom drain to filter is around 20ft, so I need to power.

    SpongeBob, I totally agree with the less speed less issues as far as the Nexus goes, but for me that's the lesser of the problems as I can't have solids sitting on my pond floor or in my drain line.

    Jay

  13. #10
    Extreme Koi Member Rank = Nanasai Ianb's Avatar
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    Nexus has been running at higher rate for a couple of days now, did filter maintenance today, when I opened the gate valve to fill the eazy there was very little solids coming through, think the bead will make up for any ammonia that gets through the nexus.
    my conclusion is that if you want slower flow rates you may experience solids in drain, I totally agree that less dwell time may effect the biological side.
    Think I will order a small Bakki now to put on skimmmer
    Thanks
    Ian

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  15. #11
    I do find it best to keep the flow rate high on the pumps, despite the fines being sucked through as this clears the pond floor better, but also as the Nexus blocks (like any filter) it does become more efficient at trapping finer particles. I only clean mine once a week u Der normal circumstances (no blanket weed clogging it totally).

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