The WGB22B whole house filtration system is an ideal "point of entry" filtration system for cleaning up water supplies to a home or business on municipal (city) water. Unlike "point of use" systems (like reverse osmosis systems) that are installed to supply water to a specific faucet, the WGB22B filters your water from the source. This means water from every output in your home will have passed through the two filtration stages of the WGB22B. The stage 1 housing holds a 5-micron high-capacity polypropylene sediment filter. This filter removes dirt and other various larger sized particles from the water that can clog the following filter. The second stage of the WGB22B houses a CTO coconut shell carbon block filter. Block carbon is more effective than other forms of carbon in that it is finely ground up carbon packed into a solidified block. This means they have a higher density than other types of carbon filters, and are therefore more effective in removing their targeted contaminants. The carbon block filter knocks out bad tastes and odors, removes up to 90% of chlorine from the water, and is highly effective on chemicals like pesticides, herbicides, and industrial chemicals.