XERO DI Cartridge - 21 Inch Contents:Empty They must also have a

They must also have a back vent cap in order for the system to work properly and not collapse while in use

3" wear pad

Comes in a 1 lb tub

tested by real life technicians working on actual houses

About the XERO Portable Hose Reel

XERO DI Cartridge - 21 Inch Contents:Empty They must also have aAbout the XERO DI Cartridge 21 Inch With the XERO DI Cartridge, you have the choice to select either a pre loaded or empty cartridge. The pre loaded option provides you with quality virgin resin and a cartridge that is ready for use once you take it out of the box! Install it in your XERO Pure, Wash iT systems, or XERO DI System and you are ready to rock! Once your TDS starts reading above 10 ppm, change out your resin by refilling the cartridge. The