Thanks to all that replied.

It's green water. Like Pea Soup. The pond is 15'x15'x2.5' (about 4000
gallons). We have a homemade bio filter, using lava rocks and mechanical
filters. There are a lot of pecan trees around the pond, but it still gets
lots of sun. No lilies or plant cover because I've used chemicals to treat
the algae in the past and it will kill most aqueous plants.

I think a uv filter is worth it, since this happens rapidly and about twice
a year we have to drain the pond and vacuum the algae from the bottom. This
in the Alabama and the pecan blooms and leaves are difficult to keep out of
the water.

"Phyllis and Jim Hurley" wrote in message
.. .
Green water or string algae or side soft algae? UV takes care of green
water only.

Jim

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"Jessica" wrote in message
...
We have lots of algea and I'm considering a uv clarifier. Any
suggestions
on a brand? Aqua and Smart seem to look like good ones. We have a pool
that is 15' x 15' x 30".

thanks,

Jessica