My family and I moved into this house almost two years ago in July, making this upcoming season our third summer here. The pool and filter setup was all in place when we bought the house, so some details are still a mystery. While caring for the pool has been a struggle, I've learned a lot thanks to good friends and my local pool store. Over the time though one problem has managed to confound me to this day.
After a short period of running our automatic pool cleaner (Zodiac MX8) the filter pressure is pushing towards 30 psi. I can clean the cartridges, start it back up with the vacuum running, and within 30-40 minutes the pressure is back up again. Now if the pool is relatively clean, or just has light debris (leaves, etc) I'll get more time out of it, but if it's sand/dust that's blown in (which happens quite a bit in the desert) I only get the 30 minutes. I do not have a dedicated suction line for the vacuum, nor do I have any valves to adjust suction/flow so when the pressure goes up the vacuum stops dead.
I've tried numerous times soaking the cartridges in dish soap overnight (found that tip on here, thank you!) but that only seems to help for a few days. I'm down to two possible conclusions...either the cartridges aren't really meant to handle the dust and dirt and the constant cleanings are just something I'll have to deal with, or I need new cartridges. Neither of these is a very pleasant idea. So my question would be, are either of my conclusions correct, or am I way out in left field? I apologize for the extended post, just trying to include as much detail as I can. Thanks in advance for any help!