A friend of mine has water meal issues in a 2 acre pond. What is the best chemical or product to use? I have seen Propeller, Wipeout, Diquat., and Clipper. Which active chemical is best? I found on here that a lot of people like Clipper SC.

With it being 2 acres what would be the most cost effective as well? Pond is 8 foot deep in center, around half the pond much shallower like 3 to 4 feet