Bought the house and closed at the end of June. Spent a number of weeks battling back mustard algae. Finally got the upper hand on it last week and the pool has been amazingly clear and wonderful ever since. All of my numbers are good as well.
Now the previous owners didnt do much, if anything, in terms of mechanical and chemical maintenance. So i've been replacing things since we moved in. Seems everything mechanically has been sound and great however i'm having issues with filter pressure. With the onset of the algae, and the constant battling, i've either been vaccuming to waste when the dead algae settled on the bottom, or vaccuming and then backwashing.
Pressure post backwash is always right around 12-13psi. Flow is never reduced and always super strong out of my returns. No main drain, just two skimmers at opposite end of the pool, always cleaned and maintained. Filter basket always cleaned out as well. So post backwashing, the pressure holds around 12-13psi but within 5-6 hours i'm back up around 17-18psi. After a few days, or after vaccuming any settled debris/waste i will spike somewhere around 20. A backwash will get me down to 12-13psi but it always comes right back up to 17-18psi a few hours later.
Question remains.......is this normal? Is my normal pressure this high? Flow is never reduced, always super strong and consistent. Filter doesnt sound like its struggling, and as far as i can tell, theres no clogs anywhere.