Amazon.com: aquarium water test strips
Freshwater Aquarium Test Strips 6 in 1 - Fish Tank Test Kit for Testing pH Nitrite Nitrate Chlorine General & Carbonate Hardness (GH & KH) - Easy to Read Wide Strips & Full Water Testing Guide, 200 Ct. 4.5 out of 5 stars. 47. 17.99.
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