I've got a lot of really fine silica sand in the pool now, circulating water through the filter creates high pressures after 20 minutes, backwash opens filter back up, but again will only run for 20 minutes or so. Vinyl pool, 4 years old, using bleach as the sanitizer, no other issues other than Pool needs to be slammed, but with the sand issues, was wondering if the best thing to do was just pump all the water out and start over? Concerned about pumping all the water out of the pool and getting the liner back in place, also concerned about potential problems with the poolkrete. Thought about using panty hose over the returns, but doesn't really address the drains at the deep end of the pool.