I have a Hayward xtreme cartridge system. I just open my pool 3 days ago and I'm using a brand new Hayward cartridge. My pool was extremely dirty when I took the cover off... the water was brown. Its been running non-stopped for 3 days and its clearing up good. This morning I noticed the water that was returing to the pool was really slow. It barely made a rippled in the pool. I cant read the pressure gauge, its all fogged up. Is this a sign the cartirgide is clogged?