Plumbing

one of the new components on my RODI is an auto shut off valve, everything seems to be working, however when the autoshut off turns off, the lowest the preasure will drop on the systeem is 28psi and waste water is still produced, ive tryed waiting up to 20min for it to drop but it doesnt....does anyone have suggestions?

as the weather starts to get colder and the leafs begin to fall im beginning to dread winter, here most of the power lines are underground but we still get our fair share of power outages lasting a couple hours on average, this year I’m considering buying a UPS to protect my investment, im just wondering if anyone uses one? i was looking at TigerDirect and they have tones, at all different ratings and prices...sort of overwhelming