Thanks for all of the advice...It's true that we have afternoon sun beating down on the ponds..in the morning, they're shaded by our maple tree.
I have a pond vacuum on my Christmas list...it might help get some of the waste out of the ponds...
I hope to get an expert in here next spring so that we can clean it right. My spasms and knee and back problems make it impossible to clean it right this fall.
Sometimes I think I should take the koi out of the pond and get an aquarium for the winter, but I really want to see if our deicer works and we can get through the winter...
Thanks again!