Well, I have pulled out the quilt batting I have in my filter the last
two days to clean it and it was fairly gunked up with some
brownish/gray muck, dead algae? Maybe its working but I do have some
pretty green water. 18watt UV, turbo twist 6x, flowing @ 850 GPH in a
1750 gallon pond that gets full sun for about 6 hours a day. Maybe the
UV isnt powerful enough to keep up with the algae?