I am hoping someone can help me. I purchased a home back in November that came with an above ground pool(24' diameter). At that time the pool water was crystal clear. When I opened the pool this spring the water was green due to a mild winter. I shocked the pool with four 128 oz bottles and one 128 oz bottle of algae chemical remover. I installed the filter and pump(Hayward Sand Filter E Series E-100) back washed, rinsed, and then put the filter on for 24 hours. After, a few hours i noticed that the return jet began to slow down dramatically. I would then backwash the filter for 30 seconds and put the multi port valve back on filter and the jets were strong again. This issue went on for the last 3 days. Last night I replaced the sand in the filter. Turned the pump on and the jets were stronger than ever, but alas this did not last for long. After, 2 hours the jets began to slow down and this morning the jets were barley moving the water. I checked all the hoses for leaks, but can not find any. I also empty both skimmer baskets every night before bed. Can anyone please help me fix this problem!!! It is driving me crazy. Thanks in advance for all the help!!!!