SA-50 Brand Copper Sulfate Granular Crystals effectively
controls both surface algae (use 61/2 -14 ounces per 1/2 acre foot)
and bottom attached algae (use 14 -18 ounces per 1/2 acre toot) in
impounded waters, lakes, and ponds. This product will also kill
roots that clog sewer lines (use 2 lbs.) without damaging well
established trees or shrubs.