As Shan stated in the post below this one, lots of factors so the product recommendations are very general. If you overfertilized last time, do only the half the amount of prosol this time. I do not fertilize by a schedule rather when clarity dicates its time to fertilize. This spring that was every two weeks because of rain. Lately for some ponds it has been good staying 18-24 incehs for over a month.

Greg Grimes
www.lakework.com