Good afternoon all. We just moved into a house with a fiberglass pool, pentair pump, and sand filter. It has 1 skimmer and no main drain. It seems after I did a backwash last week everything started to go south. First the air bubbles appeared with the pump unable to fill completely with water as you can see it swishing around in there and I have dirt/sand in the pool. A couple nights ago the pool lost 1 1/2 - 2 inches of water with the pump off. Last night I kept the pump on and woke up this morning with the pump sucking in air because it lost the same amount of water again. The pressure is fine on my sand filter and there is no water around any pump or filter or heater. I'm going to do the bucket test tonight, but seems obvious there is a leak.