Ok..I went away for a month and left my pool to my husband, who doesn't really know what he's doing. So that being said, 5 days before I come back he deploys and his friend watches my house. The pool is a bit dirty but blue and mostly clear. I immediately shut off the filter without looking at the readings because i'm pretty sure its been running non stop while at least my husband was gone (knowing him, probably the month). Then it rains and the water goes above my skimmer level. So, in order to run the filter I have to backwash some of that water out. Which I do, only to find out it burst at the connection point (I bet my husband didn't completely unroll the hose and tried to backwash and was afraid to tell me it burst) so I have to shut it off. 2 days later I have a new hose and a green pool. I backwash, and the glass shows that my filter is very, very dirty. I get the water to below the skimmer line and the water in the glass is clear. I rinse for 30 seconds, then I turn to filter and turn it on. Everything sounds fine but the pressure gauge is showing 0. The water in the skimmer is sucking down fine and strong, all 3 return jets are blowing full force. My heater is on and sounds fine. But no pressure. I try turning each of the valves in different directions (I don't know what any of it means, I just know that my pool works in this particular configuration). I open the clear basket thing and clean out the debris and feel inside and the impeller moves. Everything recently has been changed on my filter. I close it up and wait til gets prime and I definitely hear water moving inside my filter. So I think its going through the filter. I don't see sand on the floor but my pools pretty green so maybe I can't see it. But everything seems to work fine. I just don't know if its the gauge or something else. I'm kinda afraid to run it. I literally bought this new gauge 4 months ago.