How's it going, I have a sand shark 37 gpm pump and 14" sand filter. My problem now is my pressure is only at 5 psi and has been since I've been using it. Is that considered low? And my friend installed it for me and after inspecting it I see that the gasket or O-ring in the picture is probably not suppose to be there. Where is it suppose to be. Would that cause my pressure to be lowered? What should thpressurebe at? My Manual doesn't state it and company is lousy.thank y
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