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Mark,
Thanks for the information. So it is not wrong to put UV in the 1st/settlement chamber then.
DickB,
I agree that my filteration, relative to my stocking level, may not be enough during this time of the year at my place - hot, dry, full of sunshine of 12 to 13 hours every day. Prior to June, when the rainy season stopped, the water was clear without algae. I am busy right now, but I will take water readings in a few days time and be back to you.
RuthR,
Personnally, I think I agree with your analysis that the UV was simply working better in that position. And dead algae caused the water to deteriorate. I swicthed off the UV lights 2 days ago, and the kois are hungry and active again now! But at the same time the water is turning greener. A strange co-incident?
My chamber was made of concrete, except for the lower cone-shape part, which was made of a kind of PU fibre (I think, I am not very sure) and about 1.5m below water level. So it should be ok. I was told that UV light will not be effective at such depth.
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