I wasn't sure if I should piggy back on someone else's thread or start a new one.
I have a Hayward DE3620. My typical pressure over the last two years (age of the pool and equipment) been been between 12psi and 16psi, 16 being when I backwash and recharge with 80% of DE required. This year, I noticed that the norm had jumped to between 14psi and 16psi with a backwash coming at around 20/21psi. On Sunday I noticed it had jumped to about 24psi. No clue what happened, but I figured maybe it was time to clean the grids. I took to the site and to Youtube and decided I would hose down the grids in the canister without removing them. I got them basically looking new. I backwashed the filter and rinsed one more time before going to filter just to get the remaining crud out. Fired up the filter and now my new norm, all clean and not charged is 14psi. I charged it with the full 4.5 lbs. since the grids were clean and now I'm running a new norm of 17psi. Does that make any sense? Is there a possible reason for the jump in pressure? Everything seems to be working normally as far as I can tell.