I just assume 13 psi is too high becus when I feel water coming out of return jet feels weak. Like something preventing flow. When I back wash pressure feels strong again ane psi goes down to 7-8. I been going at it with this thing for almost 2 weeks maintaining high cl levels. Is this still considered normal or should I seen some results. Considering vacuuming to waste see if it works. Ill keep high cl and filter pump going for another day or so see what happens. Thanks.