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R-7063 CH Standard Solution

 
$8.50
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The Calcium Hardness Standard Solution allows you to verify the results of your CH testing.  You perform the CH test as you normally would, but substitute this solution instead of pool water.  Your test should yield 200ppm. 

It's an inexpensive and reassuring method to insure the accuracy of the Calcium Hardness chemistry as well as your own testing methods.