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Free chlorine test strips, Neutrale Etiketten
Free chlorine test strips 0-750ppm Range
Free chlorine involves the amount of chlorine that’s able to sanitize contaminants, if used properly, free chlorine can kill most germs within a few minutes. CDC recommends pH 7.2–7.8 and a free chlorine concentration of at least 1 ppm in pools and at least 3 ppm in hot tubs/spas.










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