My basic question is why do you think I'm having to clean my cartridge filter so frequently? When clean the pressure is at about 10 psi. It seems to rise to 20 within a week or two. Granted, I could probably go longer before cleaning it but I notice a SIGNIFICANT restriction in flow at 20 psi, so I clean it then and it really is fairly dirty. Lots of stuff comes out.
I wonder if I am just really too attentive to it but for maximum skimming I prefer maximum flow. I've read people going an entire year without cleaning. I just don't think I could do that!