When we returned from vacation, pool was being "watched" by my son-in-law, the water was slightly cloudy and the pump had died. Quickly ordered and installed a new pump and started to chlorinate to shock levels with bleach. It was somewhat difficult to get it clear so I started adding D.E. to the sand filter and backwashing every couple of hours. After a couple of days it started to get slightly cloudy once more. The pool was much more cloudy this morning, having 12 small children in the pool yesterday and a major thunder storm last night.
Pumps runs 6-12 hours a day depending on the conditions.