im not exactly sure what kind of pump i have but i know its at least ten years old. i believe its a 3/4 hp pump by hayward.

I dont remember exactly what my starting psi was last year but i think it was in the 12-15 range.

This year my psi wont drop below 20 even when i add fresh de. I think im going to break my filter down tonight and give it an acid wash.

when you bump, does the low psi hold for a while? when i bump my psi goes down about 5 but then it goes back up very quickly. what is your procedure for bumping?