I have an 18ft above ground pool. 52" deep. Approx 8300 gallons. I have a 1.5hp waterway 2 speed pump and a 22" milineum sand filter with 150 lbs of pool sand.

My first question is this a good combination? I run the pump on low when filtering and high when backwashing and rinsing.

I notice that when I turn the pump off, and switch the valve to backwash or rinse, water starts flowing through my waste line before I turn the pump on. Is this normal?

My pressure immediately after backwashing is not quite 2 psi. Is this normal? It seems a little low to me. Also even after running the pump for 2 or 3 weeks, the pressure does not seem to rise. I would expect the pressure to be going up. (This pressure is when the pump is on the low setting)

I have only owned my pool for about 3 months, but if I can buying a larger filter will make a big difference, then I am not opposed to doing this. I have been fighting my pool for the past 2 months and dumping lots of money in it by buying chemicals that the pool supply place has recommended. (I wish I would have found this site sooner)

Thanks for your help

Tim