No two water systems are exactly alike; however, almost any water quality problem can be defined by chemical analysis of water in the distribution system as it compares to water at the source. There are so many variations in municipal water quality; it seems strange that some manufacturers expect a single product to be adequate to treat all water systems. Experience has shown that the specific properties of the pyros, tripolys, trimetas and hexametaphosphates allow for numerous formulations and product applications so as to achieve the desired results. It is desirable and possible to develop treatment chemicals that work on specific water quality problems. Be skeptical of any manufacturer that promotes a “one product fits all” approach.