I have a sand filter; this is only the 2nd yr of use. After backwashing for almost 4 min and rinsing for over 2, I was able to get it down to 13 or 14...but never to the original starting point of 9 or 10. Pressure is stable and has been for several days. Both baskets are clean, water is flowing in and out, no excess noise from the pump, and gauge is not cracked or foggy. The water is clear, no algae. My questions: does it ever go back to the "brand new" reading, around 9 or 10? Do I still use the brand new reading to judge when I need to backwash or the new number? Thanks!
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