Bobad, thanks for the quick reply, I think your right. I put about a 1000lb of gypsum in the pond about a week ago but it really didnt go into the pond the way I wanted. The stuff sinks really fast and some of the bags were a little hard to handle after they went down with the ship earlier in the afternoon lol. I should have laid a peice of plywood across the back of the boat for more of an accurate control of the rate at which it was being poured into the water. I was wondering if I should have left all the aerators on while I was dumping to mix it in better then shut em off after I was done?