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AquaChek/Hach - Test Strips, AquaChek Select, 7in1, TH, TC, TB, FC, pH, TA, CA, 50ct - 541604A
Replaces: 18687 , 436791 , 90944016045 , AC541604
Tests for 7 important parameters in pools & spas that use either chlorine or bromine as their sanitizer.
Tests for: