Pond carbon uses a process called chemical filtration, which removes dissolved organics from your water garden. These organics can make the water yellow in color.
Pond carbon will remove colors, odors, medications and other impurities to help make your pond water clearer. It is recommended to use carbon on an intermittent basis. Pond carbon needs to be placed in a mesh bag to contain it. Once the pond carbon is in a bag, it can then be placed in an area of high water flow. Some recommended areas include: underneath a waterfall, inside an upflow waterfall filter, biofalls filter, canister pressure pond filter or other types of pond filters.