I have a Jandy 450 SQ cartridge for my roughly 15K gallon pool here in north Texas. Last time I cleaned the filter was in October. I was told the PSI would increase over time and when it went from the 10PSI post last cleaning to roughly 20PSI I would need to clean the filter again. After leaving the pool open all winter ( and swimming at least once a week at least down to the low 50s ) It is still reading at 10PSI when the pump is running.
We don't get a lot of leaves ( maybe 20 all winter ) and the skimmers are usually empty in the mornings and typically end up only needing to be cleaned at most twice a week. So is this normal to go this long without having to clean my filters? Or should I be doing it anyways periodically?