I have a big pond, in cement... the green algee it's a big problem. Just
don't know what else I can do to get rid of it!
I have a good filter with UV, but not enough. I have planted it and all,
but still not enough. I have even covered the pond with a net, so it
wouldn't get so much sun... it didn't work!
Sometimes I see pictures of ponds that are cristal clear.
The only thing I don't have it's rocks at the bottom of the pond!

Help?