We bought our house in October and didnt take the cover off of the pool until about a month ago because we were told all of our equipment needed replacing. I decided to get a head start on it and get all of the leaves, toys and rocks out. I also got the pump and sand filter working and started shocking, brushing and backwashing. Ive been shocking 2 or 3 times a day and brushing at least once a day. I had to backwash twice a day for two weeks! A week ago we got our cartridge filter installed. Our start up psi was 20 and got up to 30 within a few hours. Now every time I clean them the pressure jumps up within 30 minutes! I am worn out with cleaning these filters! How much longer will this go on? The water has been crystal clear for over a week now. I'm working on a signature.