"Well Yes I have tried in my old pond and yes they most certainly do work. my pond turned grey . Then went this strange grenish colour but had the most horrendous smell to it. Suddenly after treating it with these balls, I had such a different pond. it was fantastic the smell was going. I was starting to see how my pond really looked once upon a time before all the dam was done. & i had to start making repairs. That's jealousy for you. even the barley straw I hope will be good which in my opinion are better than the little round bags as they just float round your pond and look unsightly. while they wrote down where as these balls you don't have to worry you drop them in and leave . your day is then your own."
Reviewed Friday, 4 May 2018