Ok, this is the 2nd year for this pump/filter. End of last year the pump went up, got a new on this year, same sand filter. NEW sand in it. Ran fine all day today once new pump was running. End of day pressure was up, so i backwashed. Some sand flowed but not much, cloudy water for a minute then clear, when i turned it to rinse after a few seconds you could see in the sight glass sand building up, light brown water out the discharge. If i turn it to filter then it pumps the sand into the pool. I went back to rinse and it continued to pump sand, and not little particles the big granules. Went back to backwash and it would flow clear water and clear the sight glass. Back to rinse and it started to flow sand again!!!! WTH. I have had nothing but problems with this thing and right now i don't have the 500$ to spend on a new setup!