Amazon.com : 100 Count Smart Test 4/7- Way
Checks for 7 Key Elements: Multi-Purpose 7 in 1 Pool and SPA Test Strips for Swimming Pools check for free available chlorine, nitrate,nitrite, pH, hardness, total chlorine and alkalinity. Easy-to-use Strips: These convenient test strips are a quick and easy way to find out what your pool needs to keep it …
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