I have a Hayward Cartridge Filter which has a black ring clamp that un-screws to open it. Well when I relieve the pressure from it and unscrew it.... it is imposible to remove the top part to get to the filter. I am having to take a large flat screwdriver to pry it apart. Not really a big deal except it is leaving impressions in the plastic body. After a while this thing is going to be chewed up badly.
Am I doing something wrong or is there a different/better way to get it off?