Our MicrocynVS products are maintained in the pH range of 4-6 to assure that the chlorine is 100% in the form of HOCl.  This is also the optimum pH range for stability of HOCl solutions.  Safety testing has shown that this pH range is safe for use.  Finally, as HOCl is 80-100 times more antimicrobial than hypochlorite, it is important to keep the product under pH 6 so it maintains its highest degree of efficacy against microorganisms.