try a veggie filter. the UV kills the algae, but then what is using up the wastes?
Ingrid

"RCM" wrote:

Yes I cleaned out my pond this spring changed the water and had crystal
clear water for about a month. I have been using Pondzyme accu clear weekly
but I soon get green water followed by brown water and then the string algae
starts in around July. I have a 6000 gal pond with 30 small koi and
goldfish none bigger than 4" and several plants although also on the light
side. Could use more plants. But after three years of fighting will try
the UV method.




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