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  1. #1

    Green water any ideas

    Hi everyone,

    I been suffering with green water for the secound year running, for those of you who do not know my set up here it follows, approx 3800 running 10000 eco pump off bottom drain to a Nexus 200 followed by EA 55 watt UV, the skimmer is running eco 10000 to 3 tier shower, I thought it might be down to running the shower separate and that water not passing over UV, I turned the shower off for a week, so all the water past over UV and still green water, I changed UV bulb and cleaned Quartz sleeve, guess what? still green water!
    The pond has full sun from around 12pm until 6pm, could it be tthe UV is not enough? I thought a 55 watt would be ample, any ideas?



  2. #2
    Extreme Koi Member Rank = Kyusai 1meterchag's Avatar
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    Assuming your UV bulbs are new it can only be the flow or rather lack of it going through the UV.

    Alex

  3. #3
    Quote Originally Posted by 1meterchag View Post
    Assuming your UV bulbs are new it can only be the flow or rather lack of it going through the UV.

    Alex
    Hi Alex,
    Funny you should say that as I thought the same, I contacted EA and he advised me to slow the rate down so the UV had more contact time with water, the eco pump I'm running is a 10000 ltr but with all the distance and pipe bends its probably more like 8000 lts, I have noticed blowing the nexus everyday and constant water changes it has improved a little.

  4. #4
    Extreme Koi Member Rank = Nanasai Fishplanetkoi's Avatar
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    I had the same problem running a single 55watt, but because I didn't want to slow the flow rate down, I added another UV and it cured the green water within a day or two, and have never had another problem, due to the longer dwell time through two units. Just to say mine are 2 x 55watt TMC units.

  5. #5
    Extreme Koi Member Rank = Supreme Champion pondwithnoname's Avatar
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    H Steve, how's your nitrate readings, if they're creeping up it could account for the increase in algae.
    Alias PWNN - Steve
    My favourite and recommended web site is......
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  6. #6
    Quote Originally Posted by pondwithnoname View Post
    H Steve, how's your nitrate readings, if they're creeping up it could account for the increase in algae.
    Hi,
    My nitrate is 5.0 on API and Ph was 6.5, a little low for my liking! ammonia 0.1 nitrite 0

  7. #7
    Steve, you say pump to nexus to uv. Does that mean your nexus is pump fed? If so how does it get to uv, gravity?
    I have a submersible uv from select nishikigoi that hangs in the 4" inlet to my nexus. It keeps my 4400g clear, and there are no flow restrictions.
    UV's : Submersible UV 85cm - Select Nishikigoi International
    Mark

  8. #8
    Quote Originally Posted by balder View Post
    Steve, you say pump to nexus to uv. Does that mean your nexus is pump fed? If so how does it get to uv, gravity?
    I have a submersible uv from select nishikigoi that hangs in the 4" inlet to my nexus. It keeps my 4400g clear, and there are no flow restrictions.
    UV's : Submersible UV 85cm - Select Nishikigoi International
    Mark

    Hi Mark,
    My pond is gravity fed to Nexus pump is dry mounted after Nexus, this then goes through UV and returned to pond, my other feed is skimmer to dry mounted pump over shower and returned to pond, I'm thinking as pond is in full sun light all day, could it be the UV cannot cope, maybe a submersible one in Nexus running too would help.

  9. #9
    Extreme Koi Member Rank = Rokusai petew's Avatar
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    Quote Originally Posted by koicrazysteve View Post
    Hi,
    My nitrate is 5.0 on API and Ph was 6.5, a little low for my liking! ammonia 0.1 nitrite 0
    Hi steve did you type that right a ph of 6.5 that is way way to low my friend .

  10. #10
    Adding the submersible worked great for me, it replaced a 110w uv which greatly increased the flow through the nexus. I still have a 55w uv in the shed just in case, but so far it's not been needed in 3 years. Just install a limit switch to switch off uv when the filter lid is lifted.
    19,000 litres
    Nexus 320 with Dracodrum and submersible UV
    Blue Eco 320
    Eazy Pod on skimmer
    Dura+ 10kW Heat Pump
    15 koi

  11. #11
    Extreme Koi Member Rank = Adult Champion GHOSTDOG's Avatar
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    Nearly the same size pond as me mate gravity to a nexus 310, 12000lph,55w uv,skimmer only has wool in the basket
    Full sun all day,water has never been badly green but was a bit murky,but since covering about a quarter of the pond to provide some shade it's been loads better


    https://www.koiforum.uk/pond-constru...ging-week.html

  12. #12
    Quote Originally Posted by petew View Post
    Hi steve did you type that right a ph of 6.5 that is way way to low my friend .
    Sure is Pete, not sure why it has gone so low as I've been changing water most days, I will check ph in tap, being in Swansea with soft water ph can be a nightmare at times!
    I have added bicarb, and will do so until I raise the level

  13. #13
    Looks like two options then guys increase UV power or add a pergola

  14. #14
    Just out of interest Steve what was your KH when your PH was 6.5, I suffer with unclear water even with a new uv bulb, it has only just cleared a couple of days ago where I can see the bottom clearly not sure what causes it but it seems to be the same every year but this year has taken the longest

  15. #15
    Quote Originally Posted by greengrass View Post
    Just out of interest Steve what was your KH when your PH was 6.5, I suffer with unclear water even with a new uv bulb, it has only just cleared a couple of days ago where I can see the bottom clearly not sure what causes it but it seems to be the same every year but this year has taken the longest

    Hi,
    I tried testing KH earlier and my test kit had dried up on me I will have to pop down dealer and pick a new one up this week, the ph has crept back to 7.0, I will monitor over next few days, and will try to maintain it around this level.

  16. #16
    Junior Member Rank = Tosai MarloLee's Avatar
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    Algae can only grow in water that contains nutrients, and if you get rid of the nutrients, you get rid of the algae. Now, some of these nutrients can be quite toxic to fish, so you should be very glad the algae is there to help consume the excess nutrients and get them out of the water so your fish remain healthy. If you kill the algae using UV or chemicals, you will be left with the nutrients in the water, increasing in concentration and toxicity. Adding insult to injury, when the algae die, they decompose and add their nutrients back into the water. So what will you do then? The only real answer to the problem of algae is to reduce nutrients in the water through improved mechanical and biological filtration. Anything else you do only makes things worse.

    I've left out the other solution - dilution - because most of us don't have access to the abundant, free, high-quality water it would take to solve the problem this way in the long term.

  17. #17
    Quote Originally Posted by MarloLee View Post
    Algae can only grow in water that contains nutrients, and if you get rid of the nutrients, you get rid of the algae. Now, some of these nutrients can be quite toxic to fish, so you should be very glad the algae is there to help consume the excess nutrients and get them out of the water so your fish remain healthy. If you kill the algae using UV or chemicals, you will be left with the nutrients in the water, increasing in concentration and toxicity. Adding insult to injury, when the algae die, they decompose and add their nutrients back into the water. So what will you do then? The only real answer to the problem of algae is to reduce nutrients in the water through improved mechanical and biological filtration. Anything else you do only makes things worse.

    I've left out the other solution - dilution - because most of us don't have access to the abundant, free, high-quality water it would take to solve the problem this way in the long term.
    Thanks for your opinion I have reduced feeding for time being, and set up a trickle in/out system, also cleaning the Nexus out more regular, all this seems to be working as I can now see my bottom drain again

 

 

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