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

5. PRINCIPLE OF STRONG ACID WATER GENERATION

Strong acid water is generated at the anode inside the Electrolytic Cell where the membrane divides the anode and cathode, by electrolyzation of 0.1% or less salt water. See the figure below.

At the anode, chlorine ion (Cl-) generates chlorine gas which reacts with H2O to generate chloride and hypochlorous acid (HOCl). H2O is also electrolyzed at the anode to become oxygen (O2) and hydrogen ion (H+). Eventually, the anolyte pH falls below 2.7, the oxidation- reduction potential (ORP) rises significantly, and the available chlorine concentration reaches 20 - 60 mg/L.

[Reaction Formula]
Anode	H2O	1/2O2 + H+ + 2e-
	2Cl-	Cl2 + 2e-
	Cl2(aq) + H2O		HCl + HOCl
Cathode	H2O + 2e-		1/2H2 + OH-

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