In article , Lostin1999
wrote:

get 2 buckets, fill one up with water from the pond, and one with water
from the filter return...

compare the water (glass jam jar is brill for this) if both look the same,
the filter is not filtering..

I would not use this as a method for UV effectiveness, it doesn¹t
change the color, it effects their DNA.

then id recommend turning the UV off and
allow the filter to fill with the "good" bacteria that breaks down waste...
(a month of running without the uv should sort this) and start clearing the
water..

If there is a nitrate problem, that is another thing. I doubt it
though with no fish. The food source for the suspended algae is
probably phosphates, cultured bacteria will not effect these levels.
Floating plants; WH and lettuce are the best for this. A recent study
from Thailand said that the lettuce were in fact the most efficient at
waste removal.

This pond just doesn¹t have enough UV.

TMC of the UK have made for years and years the very best UVs.

http://www.tmc-ltd.co.uk/Pond/pondclear.asp

This is the very best unit on the market IMHO ;-)

http://www.tmc-ltd.co.uk/Pond/pro-add.asp

jay
Wed Jul 14, 2004