I BUILT A 4 ACRE LAKE IN PA. AFTER INITIAL CONSTRUCTION PONDGRASS STARTED TO GROW AROUND THE INSIDE PERIMETER AND WOULD GROW AND DIE BACK ABOUT THREE TIMES A YEAR. FISH LOVED IT AND FISHING WAS GREAT. AFTER A FEW YEARS THE PONDGRASS TOOK OVER THE ENTIRE LAKE GROWING IN ALL DEPTHS OF WATER. I INTRODUCED GRASS CARP WHICH RESULTED IN REMOVAL OF ALL PLANT LIFE IN MY LAKE. CAN I INTRODUCE ANY PLANTS THAT MIGHT BE CONTROLLABLE TO HELP WITH THE WATER QUALITY? ANY THOUGHTS OR SUGGESTIONS?