Ok, I've spent some significant time online and on hold with a local pool store, I'm pretty excited to join a forum where I can learn and maybe one day help others learn.
So my question is with low psi. I've had an INTEX pool for a few years (5,000gal) with the filter it came with, this year I upgraded to a small Hayward sand filter. Everything is hooked up, no leaks, added the recommended 42 lbs of sand and the psi is 3 on filter. The psi on backwash is 0 (although it's clearly not really zero, cause there's some water coming out.
Why is the psi so low?