Heyl Brothers is a manufacturer of analyzers that specializes in analyzing some of the more uncommon parameters in water such as hardness, alkalinity, phosphates and polymers. Hardness in particular can be incredibly … well… hard on a plant’s boiler.

Source:: http://www.wateronline.com/doc/are-you-analyzing-water-hardness-0001?atc~c=771+s=773+r=001+l=a