The Nowata 7NC20 & 11NC22 Series canisters are the most convenient type of activated carbon absorbers for systems with flow rates up to 57 gpm (using multiple canisters). The canisters make charcoal replacement much easier and cleaner than using loose charcoal beds. These canisters keep the operator from handling messy charcoal. The contaminated, spent charcoal is difficult to dispose of unless it is contained in a canister form.
Charcoal replacement canisters are designed for liquid flow from outside through the granulated charcoal into the center core. The treated fluid then exits out the sealed end of the center core. The hydrocarbon contaminants are removed through the adsorption process rather than mechanical filtration as in particulate filters.