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The user then matches that density value against a supplied look-up table and records the ppb (µg/L) result
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SenSafe® Free Chlorine EPA (Foils) Parameter_Zinc or tabletsThe First and only US EPA (United States Environmental Protection Agency) to approve a Free Chlorine test strip for drinking water use. Check your Free Chlorine with Confidence using our SenSafe Free Chlorine Check EPA. Featuring a patented indicator and a patented design, make sure your Free Chlorine levels are where you want them to be. Contains 30 individually wrapped tests. No interference from Chloramines No bleach out at high concentrations
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