no air relief valve has the multi port top valve i did move to waste until had steady stream of water being discharged per filter directions then backwashed & rinsed. is this something SIMPLE that i am overlooking? could a hose suck air without leaking water? totally stumped please someone enlighten me. surely someone else out there has encountered this before. yes air is trapped in filter but i relieve air at backwash but as pump and filter runs the trapped air seems to build. pressure gauge never goes above 20 which seems to be normal range based off last years useage