Tracy, visibility was about 24 inches before and now it's around 20 inches so it hasn't changed much. I used a cheap granule type fertilizer from the local co op which calls for 40 lbs per acre. My pond is a little less than half acre so i used 17 lbs in a bag and cut an X in it so it wouldn't touch the bottom. I feel like i applied the correct amount in the correct way, but maybe should've waited til the spring...I will just be happy if the ugly film goes away.