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« How To Test The Water In Your Inflatable Hot Tub
poolmaster-spa-test-strips-testing-the-ph-of-your-hot-tub-water
The bottom patch shows the pH of the water. The middle patch shows the Total Alkalinity.
« How To Test The Water In Your Inflatable Hot Tub
The bottom patch shows the pH of the water. The middle patch shows the Total Alkalinity.