Hoshizaki ROX-20TA-U service manual Features of Strong Acid Water

4. FEATURES OF STRONG ACID WATER

Electrolyzed water (electrolyzed functional water) is a solution with useful functions caused by electrolyzation of thin salt water or tap water. Different conditions of electrolyzation produce various kinds of electrolyzed water whose applications are categorized into: [1] sanitation (strong acid water, strong alkaline water, weak acid water, hypochlorous acid water) and [2] consumption (alkaline ionized water). The Water Electrolyzer ROX-20TA-U produces strong acid water and strong alkaline water in the category [1].

Strong acid water has the following features:

(1) Main Ingredient:	Hypochlorous acid*1)
(2) pH:	2.2 - 2.7
(3) Oxidation-Reduction Potential*2):	Max. +1100mV
(4) Available Chlorine Concentration*3):	20 - 60mg/L
(5) Color:	None
(6) Others:	Stimulative smell of chlorine
	(contains un-electrolyzed salt)

*1) Hypochlorous acid (HOCl)

Dissolution of chlorine gas in water generates hypochlorous acid (HOCl) whose ratio to hypochlorous acid ion (ClO-) varies with the pH of water. In the pH range for strong acid water, much more HOCl than ClO- exists. Both HOCl and ClO- have a bactericidal effect, but HOCl is much stronger than ClO-.

*2) Oxidation-Reduction Potential (ORP)

Oxidizing (or reducing) effect of the solution. The larger positive number indicates the higher oxidizing effect.

*3) Available Chlorine Concentration

Chlorine concentration contributing to the bactericidal activity. It indicates the amount of chlorine corresponding to iodine isolated in the following reaction:

NaOCl + 2Kl + 2CH3•COOH I2 + 2CH3•COOK + NaCl + H2O

Note: The terms related to chlorine are defined as below:

Residual Chlorine:	Remaining chlorine as the result of excessive chlorine addition into
	tap water to optimize the bactericidal effect of chlorination.
Free Chlorine:	Chlorine (Cl2), hypochlorous acid (HOCl) and hypochlorous acid ion
	(OCl-) generated by dissolution of chlorine in water.

Combined Chlorine: Chloramine (NH2Cl, NHCl2, NCl3) generated by dissolution of chlorine in water containing ammoniate or organic nitride. Combined chlorine is stable and durable, but not so effective in a quick bactericidal activity.

Available Chlorine: Combination of free chlorine and combined chlorine.

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