You can save money by buying a bag of catalytic carbon with enough Catalytic Carbon to fill one cartridge

Granulated Catalytic Activated Carbon (refillable)

The one expendable part of this system is the germicidal UV lamp can be easily changed with out any disassembly of the unit

removes 98-99% of chlorine

indicated by a blinking 'x10' image

ANION DI Resin Color Changing Bulk Media PREFILTER You can save money byANION DI Resin Bulk Media Color Changing Nuclear Grade Single Bed ANION Resin Professionally packed in a a heavy duty 5 mil Mylar bag with a very nice Ziplock seal the same day you order. (one 5# bag is more than enough for 4 x standard 10" refills) The Anion di resin media color changes from blue to amber as the resin exhausts. This helps you to visually keep track of the quality of your water. Media bags are packed the same day they ship to