Maintenance cost for replacement of the carbon or recharging with hot water is another factor that should be considered. The filter cartridge replacement interval will determine the annual maintenance cost. Finally, the time required to replace the cartridge or filter material is also a cost or at least a convenience factor. You may service the filter yourself, or you may have someone else provide this service. No special plumbing.
Some models require electric connection.
Stationary, under counter Stationary, whole house Requires connection to plumbing undersink Connect house plumbing. Requires plumbing connection and addition of separate faucet. 1 Range of percent removed is shown for models tested and average is shown in parenthesis. Maintenance Maintenance is an important consideration. Most activated carbon filter units need to have the media changed regularly.