Amazon.com : JNW Direct Pool and Spa Test Strips - 100 ...
Using a accurate dedicated hardness test of my water, it gives a reading of 50, which is low. However this test, says it is 250, which is good. A huge difference between 50 and 250. if I go by the wrong 250 reading, I'm in for some trouble. Next problem is the total chlorine test. it has a scale of 0 to 1,000.
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