My wife and i recently bought our first home and it had a wonderfull above ground pool with a sand filter. The other day I was sweeping the bottom of the pool and I left it on backwash while doing this seeing how I figgured the filter needed a cleaning as well. when I started the filter back up it was putting larg amounts of sand back into the pool. If i had to measure It I would say at least a cup every 5 min of sand. I'm thinking I broke something. What should I do?