What is the difference between the factors 5 and 6?
The factor 6 is the standard factor for use with the Bresle kit. Herewith obtained results are stated as mg/m2 measured as Sodium chloride. The factor 5 is acquired by field studies, and compensates to not a pure sodium chloride contamination but to a mixture. The exact composition of this mixture is not known. Practically the factor 5 can give better results comparing to the total salt concentration. The factor 5 is also named Total Soluble salts.