What's the normal psi range for sand filter? Just bought a new pentair tagelus 24" sand filter but I don't know if the psi is good or not....I know if it goes up 10psi then it needs to be backwashed but how do I know that my normal level is acceptable. It has a max psi of 50.
We reused the sand from the old one as it was just from last year I believe. How do we know when to replace the sand?