HTH Multi-purpose 6-Way Test Strips for Swimming Pools,
2 天前 · HTH Multi-Purpose Test Strips include six tests in one, so you can get the pool supplies you need to keep your pool balanced and ready for fun. That's less time testing, less time shopping, and more time enjoying your swimming pool. DIRECTIONS. Dip the test strip into the pool water about 18” below the water surface.
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