I don't know. I have known people who tried it but not sure it really helped. I think if you have a fertile enough pond, based on clarity as measured by a sechi disc, you shouldn't need it.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa