NSF Consumer Information: Contaminant Guide

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Look for the mark and you'll find a safer product.

Hardness
Maximum Contaminant Level (MCL)	N/A
Potential Problems	Can cause scale buildup in appliances and hard water deposits on glass and other surfaces
Potential Source of Contaminant	Naturally occurring deposits of calcium and magnesium
Applicable NSF/ANSI Standard(s)	Standard 44
Water Treatment Technologies Certified by NSF for Reduction of this Contaminant	Cation Exchange Softener
Special Notes	None