- Jul 4, 2020
- 515
- Pool Size
- 20000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
I just opened my CCP 420 filter for the first time last night, and all four cartridges are installed with the “bottom” marking to the top. Does it matter which way they are installed? Since all four were installed opposite of their marking, I thought I’d better check with the experts before I tore it up next week. 
