in ground pool 18x26 problem .put new filter in pressure keeps climbing to twenty # shuts off heat. yea so it sounds like the new filter[[ BUT]]its the same mod I took out. hayward eight piece. took the pump out looked inside ,turn the impeller things look good . question do those filters come in different mesh fillteration ?? could one of the drain lines back to the pump be clogged?? maybe a house call is needed?