En frisk tilberedt opløsning med 35 ± 2 g/l aktivt chlor (ca. 1 M), der tilsættes 5 ± 0,5 g/l forud opløst natriumhydroxid.
This consists of a freshly prepared solution containing 35 ± 2 g/l of active chlorine (approximately 1 M) to which 5 ± 0,5 g/l of previously dissolved sodium hydroxide is added.