I have an old neglected StaRite 3 cartridge system. How do I know when I should replace the cartridges? Do I replace both of them at the same time or only the inner vs outer (is one a pre-filter for the other)?
Per the pressure gauge on top (its a new one), the system is about 3 PSI when 'clean' and 5 PSI when I typically empty it. This is a new gauge that maxes out at ~15PSI.
Note that I have 1.5" intake & returns, so that may impact expected PSI rates. When I kick on the booster cleaner pump, the PSI drops by 1-1.5PSI or so. Per the flow check valve, it runs about 40GPM.
Thanks for the help on this great site!