S-Series RO systems:  

All S-Series are using quick-change cartridges. From S300 ~S800, all of them are using quick-change cartridge filter. Quick-change cartridge design makes filter changes fast, clean and easy

S-Series

M-Series RO systems:  

All M-Series are using inline cartridge filters (Disposable Filters). Standard connector 1.4"NPT for inline cartridges. From M300 ~ M800, all of them are using standard inline cartridge filters.  A high quality, but low cost system.

M-Series