I'm new to having a pool. I just bought a Coleman 18ft metal frame pool last year. My in laws gave me their intex sand filter to go with it. I got it all hooked up right but still struggled with it all last summer. I would shock it twice a week, add clarifyer, and use chlorine tablets. And it was still green. I've also tried hooking up a vacuum to the water hose but it hasn't done any good. I would hook up a good vacuum but the suction part, or I guess it's called a skimmer, doesn't seem to have all that much suction to it. The filter is also telling me it's just above 0 PSI. The part where it filters water back into the pool is running full force, though. I pretty much gave up on the pool last summer and just let it get really bad. I drained it halfway and removed all of the hoses but never properly closed it. Now, I'm trying to open it up for the summer and give it another shot but it is an awfull nasty swamp. I put 4 bags of shock in on day one, it cleared it up but still too cloudy to see the bottom. I tried adding another 2 bags of shock on day two and I still can't see the bottom. I scrubbed the bottom and it just mixed it up and turned it completely green again. The filter has been running for 48 hours straight and doesn't seem to be working. I've backwashed it and made sure no hoses are clogged and also took apart the basket to make sure that wasn't clogged. Somebody please help me fix this I feel so lost!