This is the filter cartridge and housing, for initial installation.
The 10" water filter fits neatly under your kitchen sink. GAC/Phos = Granular Activated Carbon and Phosphate.
The GAC removes chlorine and other chemicals, improving taste and odour. The Phosphate inhibits hard water scale so that even in your drinking water line you have some softening of your water.
It has a user-friendly twist-lock housing that allows you to replace your filter cartridges as easily as replacing a light bulb - simply unscrew and remove the old one and screw in the new one.
It locks off the water supply as you twist removing the need to turn off your water supply each time you replace the cartridge.