Recently added 2500lbs of Gypsum to my 1 acre pond (12' avg depth) using the dump into prop wash method. Took around 2 weeks but I have gone from seeing roughly 2-3" to around 10-12". I am seeing bass swimming around my pond which is a first for me! I am beyond ecstatic! Took some work to get it done but hopefully will be worth it in the end. I have come to this site many times for useful and valuable information and have never been let down. I appreciate everyone's input. grin grin grin