i just ordered aq4 supposed to get rid of algae, microbes supposidly eat the algae they say it doesnt harm fish or animals, the outlet stream flows north so wind keeps algae in the pond we have tried pumps and raking but cant keep up, i will let you no if it works, got a spring fed pond, my fathers friend took a bass out that we had been letting go for years 8 more ounces and it would have been a state record, there were times we would be reeling in a sunny and he would swallow it, but now the algae has taken over