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So my filter was broken all winter . I rented a pump and drained down to the shallow end. There was a pretty thick layer of algae covered leaves down there. I shoveled them out of the shallow end and refilled. So, I can only assume the deep end is the same or worse. Do I shock first then...

Hello! I have a Hayward 36 sq ft DE filter (don't know model, sticker came off a long time ago) with a 4 port Hayward selecta-flo valve. I just had 3 of the grids replaced, got everything back together, and can't get the pump to prime. This happens every time and every time I mess with it...