Probably 100 gallons we put into the empty pond. We put it in the ground outside for the chickens, and it has nothing besides water in it. (No fish, rocks, etc) Recently I've noticed a lot of my chickens having diarrhea, and I'm wondering if the fact that we haven't cleaned the pond could be the reason. I'm feeding them layer pellets and none of the chickens seem to be having any other signs of illness. We put the pond in around the beginning of December. I'm going to clean the pond out later today anyways, but i'm still very worried.