New Pool in March so I'm a rookie with some of this stuff.
I have a Jandy DE Filter with Praher Multiport valve. I noticed last night when the pump shutdown that air was bubbling back through the pump into the strainer basket. When I place my hand over the waste line (no drain hose normally connected) I can feel it pulling a very slight vacuum allowing air into the system. Does this mean my multiport valve spider gasket is all ready bad after less than 2 months? Does it mean my DE filter needs a good backwashing? I've never backwashed nor moved the multiport valve for that matter. Any help would be most appreciated.