We've been using Roundup on our ponds to remove spatterdock for several years. It was recommended by the fish biologist for the state fish & game dept. It won't work on algae, very little will. There are products available form aquacide that work well on that. There is a form of Roundup that is made expressly for use on ponds. It's supposedly more effective but is a whole lot more expensive also.
dun
> Dirt in the water will probably
> limit the value of the roundup. It
> will however be bad for the fish.
> The safest product I have seen to
> clear moss from ponds is Copper
> Sulfate. You apply it from 5 lbs
> to the acre of water surface. Use
> a hand crank grass seeder from a
> boat. it only works in the area it
> is applied. If you treat the whole
> pond at once the decaying moss
> will kill the fisk for lack of
> oxygen. Its also safe for cattle
> to drink. Check with local feed
> store, copper sulfate is cheap.
