Hi everyone. I am really trying to understand all of this but man, it really isn't clicking with me. I probably should hire someone but I'm low on funds. I have a Summer Escapes above ground pool (kind of small) & someone gave us an older Hayward sand filter & pump. We drained the pool water from last year, with a little bit of yucky mess left in the pool, I refilled with fresh well water over a 3 day period. The frogs have really enjoyed my pool over those 3 days lol. Okay, so I loaded the pool up with shock & turned the pump onto "filter" but the pressure was low so I decided to switch it to recirculate & the pressure was amazing! I left it on recirculate over night & the next day the pool was no longer yucky green & was now a cloudy blue/green. When cleaned out the filter cup that is connected to the pump, there were 5 bleached dead frogs. I decided to switch it to "filter" again... at first the pressure was good, water was being moved quickly (the pool water almost looked like a whirlpool) but after about 10 minutes it dropped down greatly & didn't even have half of that pressure. The psi gauge (I think that's what it's called?) stays at about 17-20, the same either when I put it on filter or recirculate. I don't think that when the filter is set to "filter", it is actually going to clean it. Do I need to backwash or prime? (I don't know how to do either, go figure) Go easy on me, I probably shouldn't even be messing with this thing but I really want to learn how to get it up & running so my kids can have a fun summer at home.