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There are two main technologies for producing hypochlorous acid:

One is electrolysis: by electrolyzing salt and water, high-concentration hypochlorous acid is obtained by some techniques, the pH value is generally 5.0-8.0, and the effective chlorine concentration is 500- 1000ppm. The generated hypochlorous acid is unstable and needs to be stabilized. As for what the stabilizer is, it is their core secret. I don't know, so whether the hypochlorous acid generated in this way is toxic depends on what the stabilizer is.

Secondly, non-electrolysis: using sodium hypochlorite and hydrochloric acid as raw materials, the generated hypochlorous acid is relatively stable through some technical means, such as "CELA" weakly acidic hypochlorous acid, which has been passed down by Japanese brands for 30 years. Its shelf life can reach 18 months in dark environment, its PH value can be controlled at 6.20-6.80, and its effective chlorine concentration can reach10.