I have a 10,000 gl. above ground, and have had trouble with the water flow through my cartridges becoming restricted. I get a new cartridge and within a few weeks I go from 11-12 lbs. on the gauge, to 18-19...and with no "visible" debris on cartridge. I can take it out and hose it off, and it'll go down to about 14lbs., but will be right back up to around 18-19 lbs. about an hour later. And of course at that pressure there's very poor circulation.
I've also recently discovered I wasn't accurately testing my ph levels. Now I am thanks to recommendations I've received on this site, and I found out my ph levels have been at least 8 or above. Been struggling to keep chlorine levels up as well. My water is clear but I've been adding chlorine like crazy!
I've got the ph down now to between 7.4 and 7.8. Could the restrictions in my cartridge be tied to the chronic alkaline water I had? Thanks for your time