Water filters are replacement cartridges that is placed inside water canisters.
You get lots of different types and sizes of water filters the most common ones used is the 10-inch filters for your kitchen water purifiers and your 20-inch filters used in your whole house water purifiers.
Water filters are used to filter out a whole array of contaminants from your water
Water Filters
Whole House 20 Inch Slim Filter Set
Full water filter set for 20 inch 3 stage whole house ...
Activated Carbon Block 20 Inch Fat (Big Blue)
Activated Carbon Block 20 Inch Fat (Big Blue)