Here's a YouTube instruction video on how to build a kitchen countertop drinking water filter for removing fluoride and chlorine using water filter parts available from plumbing suppliers on the Internet. The parts needed to construct a working water filter, for municipal water filtration, include a countertop filter housing, inlet and outlet fittings, tubing, spigot, spigot holder and faucet diverter valve for connecting the water filter to a kitchen faucet. Once connected, a knob is rotated on the diverter to transfer the cold water from the kitchen faucet to the countertop water filter. The water flows through the filter cartridge and out the spigot producing fluoride or chlorine free water. Carbon water filter cartridges are mainly used to remove chlorine from drinking water, and must be replaced yearly. Single fluoride removal cartridges may be installed, using activated alumina or bone char carbon, and also have a one year life.