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  1. #1
    Junior Member Rank = Fry Koiz's Avatar
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    UVC Within Nexus 220 - Is It Possible?

    As a project for the new year, Iím wanting to re-do the pipework that returns water from my gravity fed Nexus 220 to my 11,500L pond.

    Currently, the water is pumped back with a 10K AquaForte Vario via a vertical KK 55W UVC but goes through nine, yes NINE right hand bends before entering the pond. Iím losing a lot of flow and using a lot of electricity with this set up hence why I want to change it. I also want to increase the flow in the hope that it will keep the bottom of my pond cleaner as currently the corners and farthest edges do collect debris (which I periodically sweep towards the BD), as it doesnít pull sufficiently down to the bottom drain. There floor does slope towards the BD, though whether it is steep enough I'm not sure, but at the mo Iím using a filter pump sat in one corner of my pond to create a better circulation on the bottom which is hardly ideal and just gives the Koi something to bash against!

    Since this pond was built in 2017, Iíve learned a lot and have a number of regrets, one being I wish that Iíd had two returns to the pond, one just under the surface (as it is), and one lower down to ensure the bottom circulated well, but you live and learn!

    My Nexus sits in a filter house right behind the pond (pics in my profile album) so all this extra pipework is purely to divert the water through the UVC. Due to the space restrictions of my filter house, I'm thinking the best solution with the least pipework would be to have the UVC actually within the Nexus, perhaps in the inlet like it is in the EazyPod Complete Ė or the outlet, but I need a 55w, not the 18w thatís in the Eazy.

    I have a Draco Drum in the centre of my Nexus, hence why Iím thinking inlet or outlet of the Nexus. If I can get a UV into my Nexus somehow, then the maximum bends to return to the pond would be three which would be a significant improvement on the current set up.

    Iíd be really keen to hear of anyoneís ideas of how to achieve something like this.


    11,500L Raised Pond, BD, Draco, Nexus 220, 55W UVC, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  3. #2
    Senior Member Rank = Gosai Sim's Avatar
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    I had a UV in my drum and managed to break the glass after a couple of months, expensive mistake.
    Rather than repair it I've bought a oase gravity UV 4" in 4" out I'm going connect it the back of my bio chamber then into pump to return.
    You could probably put one on the nexus out then pump back to pond.

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  5. #3
    Junior Member Rank = Fry Koiz's Avatar
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    Hi Sim - that's a very interesting suggestion, thank you

    Am I right in thinking you mean this: Bitron Gravity 55 Watt UVC It's a lot more than money I was hoping to spend .. but then it's Oase!

    The only issue I could see is that the return hole through the wall and fibre glass in my pond is only 1.5" I wonder if it would cause a problem if I was to reduce the pipework coming out of the Bitron down to that size fairly quickly because it wouldn't have far to travel to the pump and then the pond? Could pressure build up and damage the UV, or would it just cause extra dwell time and actually make it more effective?

    The other question is whether this is actually just a CLARIFIER or a STERILIZER? The blurb on the Oase website seems to use the terms interchangeably which is very confusing! Do you know if it does actually sterilize as oppose to just keep the water green-free? If it sterilizes, I can see the justification for the price and the benefit of such an investment.

    Are you planning on installing yours soon? If so, could you let me have some feedback on how you get on with it?

    Does any one else use a Bitron who could advise if it is worth the money?
    11,500L Raised Pond, BD, Draco, Nexus 220, 55W UVC, 2x10k Aquaforte Varios, Skimmer to Waterblade

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  7. #4
    Senior Member Rank = Gosai Sim's Avatar
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    Hi
    Not sure whether it sterlises or just clarify's, will try and Google the bulb type later and perhaps someone else would know.
    They do talk about sterilization and say it will strerilise to a flow rate of 12..5 m an hour.


    I do a similar think to you out of the UV into the pump them come out with 2" and reduce to three 1.5 returns.

    You can use the UV at either end of filter, was suggested to put it on the skimmer before the drum.

    Personally I don't like the idea of unfiltered water going through it.

    It can be fitted vertical or horizontal, it can also go straight onto the back of the bio chambers as its shielded within the unit (I asked as was concerned).

    I agree with you on cost , ask your dealer for discount, but also I spent around £350 on the submersible uv and it only last a couple of months.
    I would have to spend £150 to fix it (new sleave and bulb)
    So that makes the new one seem cost effective now!

    I won't fit until the spring now as still thinking of changing the bio chamber and having one made.

    Simon

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  9. #5
    Senior Member Rank = Grand Champion andikoi's Avatar
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    you could get one of the drop in types like the amalgam,or https://www.ebay.co.uk/itm/Large-Fis...222e%7Ciid%3A1 something like this and drop in inlet or outlet,as it is open all round i dont think you need as much power,,,,,andi

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  11. #6
    Junior Member Rank = Fry Koiz's Avatar
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    Hi Sim – the Bitron does look a really good option, and agree - I also prefer to run clean water through a UV so it would be on the return to the pond.

    Hi Andi – have you any experience of using something unbranded like this? I love the price, and could afford to put two in the outlet which would really ramp up the effect, but always reluctant to buy when it’s not labelled, esp the risk of electrics in water! Perhaps I’m just being a big woose. I pale at the cost of the Oase, but balk at the affordable unbranded option. ARGHH!!!!
    11,500L Raised Pond, BD, Draco, Nexus 220, 55W UVC, 2x10k Aquaforte Varios, Skimmer to Waterblade

  12. #7
    Senior Member Rank = Grand Champion andikoi's Avatar
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    ive kept meaning to get one to try but never got round to it lol,i have a 55w tmc after my nexus which has worked admirably for years,i used to have a bitron 55 years ago on an old oase screenmatic,i could never get the flow right and the self cleaning part never worked properly either,its just like a plastic frame thats supposed to spin and keep the quartz sleeve clear,it never span properly for me though,,,,,andi

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  14. #8
    Senior Member Rank = Gosai Sim's Avatar
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    Yes I had one of those Andy years ago, on a filter box with all them sponges that needed cleaning glad things have moved on lol.
    The 4" gravity seem good though all stainless casing comes apart quite easily and the bulbs and spare are not to outrageously priced.

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