I realized yesterday that when I switch to the main drain on our pool my pressure goes to 0. We bought the house in march so I'm just learning. I got in today and in the drain there is a pipe to the side and a plug in the hole at the bottom of the drain. The drain is a Hayward 1048-c. I took two screws out of the cover 180° from each and inside the ring with 8 screws but I cannot get the cover off.
I tried twisting and pulling. Wouldn't budge. Do I need to remove the 8 screws around the outer diameter or what.