These sanitation problems can be prevented or minimized through advanced knowledge of the raw water quality. One factor of prime importance is water hardness. Water hardness is responsible for excessive soap and detergent consumption (with hard water, more cleaners will be required as minerals precipitate out with the alkali cleaners), mineral deposits, undesirable films, and preciptates. When hard water (>120 ppm CaCo3) must be used for cleaning, the addition of chelating or sequestrating reagents is necessary.