When pH and temperature are lowered many organic chemicals are in a more adsorbable form. Exposure time The process of adsorption is also influenced by the length of time that the AC is in contact with the contaminant in the water. Increasing contact time allows greater amounts of contaminant to be removed from the water. Contact is improved by increasing the amount of AC in the filter and reducing the flow rate of water through the filter. They work like a drip coffeemaker.
Water is poured in the top and filters by gravity through the filter to the bottom.
These filters are quite slow and handle only small volumes of water. Faucet-mounted AC filters are small units attached on the end of a standard kitchen faucet. They are convenient to use, but because of their size require frequent change. Some units have bypass valves, to filter just the water needed for cooking and drinking. They are installed on the cold water line, and some units are installed with a bypass to separate cooking and drinking water from other uses.