I got the impression that the duck population really had a major part in algae growth. Instead of hanging around the river....they chose the reflecting pool.
THAT I would not deny. A lake (pond, actually around here) has so many gooses shiiting everywhere that you can’t take the kids there, can’t fish the thing correctly and I wouldn’t put my bass boat in it to keep from burning up my Minn-kota. Yet the County won’t let hunting the flying the rats depopulate the area, because that’s cruel.