Might be time to call the pool guy I have a pump that the water level in the bowl goes down halfway in about 8 hours (so it struggles to reprime itself). Slow leak "somewhere" (on suction side). I decided to order a new bowl o'ring, and new gasket for the Pentair multi-valve. O'ring for the basket, no sweat. Multi-valve... lots of sweat. Didn't realize it was glued down, took about 3 hours to clean out the glue/stuck rubber. Put the new one in, lots of leaks. I guess it is supposed to be glued... (yes/no?) If so, what kind of glue? My plan is to dry it out in the AM and fix it in the afternoon tomorrow (or call the poll guy).
edit.... isn't Google wonderful. Found my answer at another site on how to replace the spider gasket:
Using Loctite® 401 or 416, apply glue sparingly (a bead
about 1/16” wide) to the bottom only (not the sides) of
the spider groove in the valve body. The glue lines
must be continuous and intersect at the intersections of