I also use the "on the go" unit. I use the supplied hardness test strips and found that I can go 2 to 3 months before the water goes hard. It also saved the anode in the water heater, it was only half as much wore down last winter compared the winter before in California and Arizona where the water is very hard.
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2013 Redwood 36RL, 2011 F-450, Sat Internet, Sat TV
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