Thanks. I have noticed that since i have the water quality in better shape(no algae, good Chlorine Levels) that the cleaned filter(6 months old) goes in and starts at 24PSI, then within 8 hours it is up to 30PSI. I take the filter out and wash it with the garden hose and notice that it is not really that bad(dirty). I know that this can't be normal as the pressure coming out of the jets does diminish quite a bit when it is running at 30PSI. When it is at 24PSI the flow is good and strong, but as i said within 8 hours or so, it jumps up to 30PSI and pressure is diminished. I am going to order a replacement filter but i suspect that i just need to get a bigger filter, like the 100sqft one mentioned above and hopefully the time between cleaninigs will be less. My old 50sqft filter used to last 1 to 2 weeks between cleanings, this Hayward although the same size(50sqft) just does not match up. The old one was the Sta Rite 50.