my aerator was running 12 hours a day before yesterday evening, and there have been times that i have switched it to 24/7 for the weekend with no issues. when i added alum to clear up the turbid water i left the aerator running 24/7 for a few days with no problem. my pond was turbid with suspended clay after we built it and it filled. after about a year and a half i put alum in it to clear it up this summer. i waited so long to put the alum in to let the grass regrow some. within a day my pond was clear as a spring, like 10' visibility. within another day or so it was turining green like a bloom. a few days later it was pea soup green. then i started noticing fa accumulating around the edges of the bank. and as of yesterday i probably had 2' of fa all around the edge of the pond. I sprayed it all with the cutrine plus then added aquashade and started the aerators.