I am SLAMing today. Just got back from the store with DE to add to my sand filter I put in shock level liquid chlorine first. Then added 1/4 cup of DE as recommended here, not the 1 cup suggested on the side of the box.
Pressure gage before 1/4 cup of DE:
Pressure gage after 1/4 cup of DE:
11+ PSI (but not 12)
Is that all I do for now?