Yep, it is time to shock your pool. Even though your water is "clear" the cartridge filter is plugging up because you are killing algae in your pool.Ok, thanks. Do you know if algae would plug cartridge filters. I have problems with high pressure on the filter. I have cleaned them twice but pressure is about 12 psi higher than when I started the pool.
Did you pass all three of the criteria to know when you are done with the shocking process? They are also listed in my sig.slayer said:Shocked the pool friday, saturday and sunday. Chlorine was high and came back down by Tuesday.
Again, this is unrelated to your issue but your filter and pump match one another fine. It's a little bit large for your size pool but the only downside is a small increase in electrical consumption.120gpm