I have a catridge filter not a sand filter, yet, I am noticing sand in my skimmer as well as the bottom of the cartridge tank and I'm not sure if that's normal? There's not like a build up of sand, but it's noticeable.
BTW, my test results for water chemistry are as follows:
Total Alkalinity: 75
CYA : 70
Salt: 4200 (I need to calibrate my new Auto Pilot Digital Nano because it's reading 3000)
Borates: 30-40 (can't tell for sure using LaMotte test stips so I'll add 10 ppm using the pool calculator and ret-est)
Thanks for your help and sorry if this is a dumb question but I'm a newbie