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@moore887, not sure what test the pool store uses. but I will find out. I guess after using the OTO test for more years than I care to remember it's hard to believe there can be that much of a difference between the tests. Thanks everyone.

Hello, We purchased the 2006 FAS-DPD test kit to more thoroughly test the pool water. However in comparison to the OTO test or results from Pinch-a-Penny the chlorine test always comes out to about twice as high. Meaning currently Pinch-a-Penny says the total chlorine is at 4ppm. The OTO test...