Thanks Richard,
I looked in the City web site and found drinking water report. Ca hardness 41.5 ppm, Mg hardness 8.8ppm and Ca/Mg hardness 140. They also gave a Total Hardness as CaCo3 of 168. I am assuming I should use the Ca/Mg Figure for determining the size of the H20 softerner? I promise this is the last time I will bother you about this.
Rick