Hello All. Wondering if anyone has some advice on a filter issue I have. I just opened my pool last weekend. Got everything fired up fine. Takes the pump a long time to prime because the equipment is about 30 ft away and 8 feet higher than pool level. It's a 2hp Pentair superflo. Normally, I very quickly go from filter, then pump off, then valve to backwash, then pump on, and I get backwash flow within seconds. However, when I went to backwash it, it took a very long time to prime to backwash (I have a Pentair Sand Dollar filter). And then after the backwash, I waited for 10 minutes to rinse but it never flowed to rinsed. The pump was running but there was nothing but churning water in the pump bowl. I got scared that I may do damage to the pump so I stopped it and went to filter, which worked fine. I vacuumed out the pool and, once again, went to backwash it. This time the pump wouldn't prime to backwash. I let it run for a long time hoping it would start, but nothing. The pump seemed to be running fine but I couldn't get any flow. So I put it back to filter and it's running fine in filter mode. Any ideas? How long can I run it in backwash waiting for flow? Thanks for any advice.