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Thread: Green water any ideas
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03-07-2016, 12:34 AM #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?
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03-07-2016, 02:40 AM #2
Assuming your UV bulbs are new it can only be the flow or rather lack of it going through the UV.
Alex
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03-07-2016, 08:31 AM #3
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.
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03-07-2016, 08:39 AM #4
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.
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03-07-2016, 11:12 AM #5
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......
http://www.mankysanke.co.uk/
http://www.freewebs.com/koikoi/
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03-07-2016, 02:32 PM #6
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03-07-2016, 03:58 PM #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
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03-07-2016, 05:00 PM #8
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.
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03-07-2016, 05:06 PM #9
- Join Date
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03-07-2016, 05:12 PM #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
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03-07-2016, 06:13 PM #11
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
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03-07-2016, 06:34 PM #12
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03-07-2016, 06:37 PM #13
Looks like two options then guys increase UV power or add a pergola
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03-07-2016, 07:19 PM #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
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03-07-2016, 09:44 PM #15
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06-07-2016, 08:14 PM #16
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.
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07-07-2016, 06:39 AM #17
Running heater at low temp?
Covering the pond with polycarb should be enough to stop water temps dipping below 6C for the most...