Pool Lab Official Reagent for measuring Total Hardness.
Includes two bottles. Total Hardness 1 (POL20TH1) and Total Hardness 2 (POL10TH2).
Measures 0-500 mg/l (ppm) of Total Hardness in Swimming Pool or Hot Tub water using the Pool Lab 1.0.
See directions for use for usage instructions.














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