"cockroach" wrote in message
om...
I built a 3000 gallon pond in my backyard. Its made out of concrete.
Its mostly a goldfish pond, about 20 fish, several water lillys etc..

I have a large filter(it uses charcoal like gravel to filter) but its
no use. The water is so dirty that you cannot anything.

I have used some products to get the pond clean, but none have worked.
My fish are not dying, so I guess the water is alright. But I still
cannot get it clean.

The water is brown in color, and there is gunk everywhere. The surface
is actually pretty clean, no leaves or anything.

Do I need to Drain the pond and start over?

I have the same problem, because my pond is new. Up until this past week, I
had nothing on the pond edge so my clay soil was pouring due to torrential
downpours for weeks. To rectify I placed sod around my pond to keep more
clay from falling in.

My solutions now include 1) wait it out, and it should all fall out
eventually, 2) use alum or calcite as a flocculent. I was using 1), but am
quickly thinking of switching to 2).

BV.