The effectiveness of a commercial magnetic device in suppressing CaC03 scale deposition was investigated in a system consisting of a cast iron pipe through which hard water flowed at ambient temperature. The main variable studied was the supersaturation level of the CaC03-forming tons over a range represented by (Ca2+XC032~) = 20 X 103 to 65 X 10® (ppm as CaC03)2. The effect of magnetic exposure on scale suppression was evaluated from measurements of the rate of deposit growth, the extent of the induction period, and the adhesive nature of the incrustation. The accurate rate data showed that magnetic exposure had no effect on deposit growth. Similarly, magnetic exposure exerted no effect on the adhesive nature of the deposits. The less accurate induction period data did not reveal a statistically significant difference either.

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