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Home > News > Don't confuse Hypochlorous acid water with traditional chlorinated disinfectants!

Don't confuse Hypochlorous acid water with traditional chlorinated disinfectants!

The following article is from Electrolytic Water Technology Channel, author of Electrolytic Water Technology Channel

There are differences between hypochlorous acid disinfectants and traditional chlorinated disinfectants in terms of percentage of hypochlorous acid, bactericidal effect, safety and corrosion. So don't confuse hypochlorite disinfectants with traditional chlorinated disinfectants....

Chlorine-containing disinfectants:Disinfectants dissolved in water to produce hypochlorous acid with microbicidal activity, whose microbicidal active ingredient is often expressed as effective chlorine.

Hypochlorous acid has a small molecular weight and can easily diffuse to the surface of bacteria and penetrate the cell membrane into the body of the bacteria, causing the oxidation of bacterial proteins and leading to bacterial death.
Chlorinated disinfectants kill a wide range of microorganisms, including bacterial propagules, viruses, fungi, tuberculosis bacilli and the most resistant bacterial germ cells. These disinfectants include inorganic chlorine compounds (e.g., sodium hypochlorite, calcium hypochlorite, trisodium phosphate chloride), organochlorine compounds (e.g., dichlorodiphenyl ether, calcium hypochlorite, trisodium phosphate), organochlorine compounds (e.g., sodium hypochlorite, calcium hypochlorite, trisodium phosphate) and chlorine compounds. Sodium isocyanurate, trichloroisocyanuric acid, ammonium chloride T, etc.).

Because acid electrolytic water technology/water hypochlorite technology was developed late in the country, many people, and even regulators, are not sufficiently aware of it in Regulation still follows the standards of traditional disinfectants, which are required to be used at concentrations of 200 ppm or more The concentration. The vast majority of current domestic generators/packages of Hypochlorous acid water cannot and need not reach such high concentrations, and for this question. How do we respond?

Next, we will give you a detailed description of the differences between hypochlorite disinfectants and traditional chlorinated disinfectants through 3-5 articles, in this inorganic chlorine we use sodium hypochlorite as a comparison, in organic chlorine we use sodium dichloroisocyanurate as the object of study to start this comparison....


Let's start by defining a few keywords.

disinfectants with chlorine: A disinfectant that dissolves in water to produce hypochlorous acid.

disinfectants with hypochlorous acid: A disinfectant with a stable hypochlorous acid in the original Disinfectant Solution.

acidic electrolyzed-oxidizing water: A low concentration of sodium chloride (less than 0.1% of solution) is added to softened tap water in an ionized diaphragm. It is an acidic aqueous solution with a low concentration of effective chlorine and a high redox potential that is produced from the anode side after electrolysis in an electrolysis bath.

slightly acidic electrolyzed water: Softened water with low concentrations of hydrochloric acid and or sodium chloride is electrolyzed in a diaphragm or diaphragm-less cell to produce hypochlorous acid-based water. Acidic aqueous solutions (pH 5.0 to 6.5) of the main bactericidal components.
The main functional component of both acidic oxidation potential water and slightly acidic electrolytic water is hypochlorous acid, which can be stored stably under certain conditions. Therefore, acidic oxidation potential water and slightly acidic electrolytic water produced by electrolysis, or non-electrolytic hypochlorous acid water produced by mixing method can be called hypochlorous acid disinfectants as long as they meet the standard requirements.

Sodium Hypochlorite: Sodium hypochlorite, which is a hypochlorite of sodium. Sodium hypochlorite reacts with carbon dioxide to produce hypochlorous acid, which is the active ingredient in bleach.

Dichloroisocyanuric acid: It is a white powder or granular solid, which is the most broad-spectrum, efficient and safe disinfectant among oxidative germicides It is the leading product in isocyanuric acid. It can powerfully kill bacterial spores, bacterial propagules, fungi and other pathogenic microorganisms, and has special effect on the hepatitis virus. Kills and strongly inhibits algae such as blue-green algae, red algae and seaweed in circulating water, cooling towers, pools and other systems.

Available Chlorine: is the amount of chlorine in a chlorinated compound (especially when used as a disinfectant) that has an equivalent oxidizing capacity and can be expressed quantitatively as a disinfection effect, or simply as chlorine with a valence of ≥0.


Since the bactericidal principle of chlorine-containing disinfectants is based on hypochlorous acid dissolved in water to produce microbicidal activity, then the content of hypochlorous acid to a certain extent determines the strength of the bactericidal capacity of chlorine-containing disinfectants.

Next, let's compare the percentage of hypochlorous acid in different chlorine disinfectants. The percentage of hypochlorous acid in effective chlorine in disinfectants can be calculated according to the following formula.


From GB/T 36758-2018 Hygiene requirements for disinfectants containing chlorine Appendix C Determination of hypochlorous acid content

Effective chlorine concentration of 200 ppm sodium hypochlorite, pH 9.0 (this value is a reference value), hypochlorite as % of effective chlorine 2.6 per cent and 5.2 ppm of hypochlorous acid.
Sodium dichloroisocyanurate with an effective chlorine concentration of 200 ppm, pH 6.0 (typically 5.4-7.0), hypochlorite 96.3 per cent as a percentage of effective chlorine and 192.6 ppm of hypochlorous acid.
Effective chlorine concentration of 40 ppm hypochlorous acid, pH 6.0, 96.3% hypochlorous acid as % of effective chlorine, hypochlorous acid The content of 38.5 ppm.

Also, the effect of pH on the percentage of hypochlorous acid in solution can also be seen in the following figure.


Fig Percentages of different forms of free chlorine at different pH values.


So one has to ask, can't hypochlorite ions sterilize?


The surface of the cell membrane is negatively charged, so hypochlorite roots (ClO-, also negatively charged) cannot easily enter the interior of the cell, whereas hypochlorous acid (HClO) is a small, neutral molecule that can penetrate the cell membrane, enter the interior of the cell, and react with its internal DNA and mitochondria, killing them.


Sodium dichloroisocyanurate also has a high percentage of hypochlorous acid content, so why is it not recommended for use as a disinfectant in everyday life?
C3Cl2N3NaO3+ 2H2O a(C3H2N2N-O3)+ 2HClO+ (Na+)
When sodium dichloroisocyanurate reaches hydrolytic equilibrium in water, the concentration of HClO in the aqueous solution is low, but once it reacts with other reagents, the concentration of HClO in the aqueous solution is low. As a result, sodium dichloroisocyanurate, which is a major source of HClO, will slowly release HClO as the equilibrium shifts to the right when HClO is consumed. It is a slow-release disinfectant and does not produce large amounts of hypochlorous acid for short periods of time.

Hypochlorous acid water is a new generation product,pls fell free to contant us for more detail information.

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