The filter seemed fine when I cleaned it. I also changed the filter back to the one I used late last year. I try to rotate the filters some and buy a new one each year and throw away the older one. I run the pump on high about 95% of the time and have for 3 yrs. The Algaeside was just HTH, unfortunately all we have in our small town. I very seldom use any. I will try to purchase some Polyquat and keep for future problems. We had a large group of swimmers on Saturday and I hit it that evening with 3 more bleach. It seems to slowly be clearing up but still far from perfect!