Its a good way to cut down on algea and keep water from getting stagnant. I get paid to ride my jet skies at heath beach 1 or 2 times a week to keep shit from forming, it really does make a difference.
Just got a call from Chuck at the beach, asking me to please bring the jet skis out and "stir up the lake" probably spread some copper sulfate too. Guess I better fire them up.