I have a Hayward S200 Sand filter and recently replaced the sand. Took old sand out, added water then the new sand (200# as the specs indicated). It's been a few weeks and everything seems ok unless we backwash or have the filter turned off for a time. As soon as we turn back on to filter, we can clearly see sand shooting into the pool for a minute or so. It stops after that and everything is fine, but makes the water all cloudy and have to vacuum up the sand once it settles. When we don't backwash the filter seems fine and pool is crystal clear-no sand deposits. Could we have too much sand it the filter? Broken lateral? Something else?