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Slowly add white vinegar, (or dilute solution of HCl hydrochloric acid, also called Muriatic acid), 1 mL at a time while stirring, monitoring the pH, and stop on reaching the desired pH. If the chemistry of source water remains unchanged, this same amount of acid for pH adjustment can be used every time. If you accidentally add too much vinegar, the pH will drop too much and you will need to raise it. Adding baking soda in small steps (in 1/2 g increments) will accomplish this. Stir well after adding. Test again with a pH strip, adjusting as necessary to reach a pH of between 5.0-6.5. Storage: The solution will keep its potency for 2 full weeks if stored in a plastic or glass bottle, away from bright light, at a cool temperature. Storage at high temperatures will reduce useful life. Storage in a dark and/or opaque container will increase the useful life. At the end of its useful life, the solution returns to just a simple salt solution. Use: The solution has only 7,500 ppm salt, less saline than tears, and will not cause noticeable salt deposits on cleaning surfaces. It can be also used to wash food items to disinfect them (these can be consumed directly afterwards). Use it, or give it away to your friends, employees, and family. ----------------------------------------------------------------------------------------------------------- SCIENTIFIC UNDERSTANDING Batch Process for 4 L of dilute HOCl, ~250 ppm, in ~30 minutes. Background Calculations. Key equations: Current (amperes) x time (seconds) = Coulombs 96,500 Coulombs = 1 Faraday of charge (releases 1 gram-mole chemical with single charge) 1 ppm = 1 mg/L Molecular weight of Cl is 35.5, and of Cl2 is 71 So, 96,500 (~100,000) Coulombs of charge release 71 g of Cl2. I.e., ~100 Coulombs releases 71 mg of Cl2 Assume we want to obtain 1,000 ppm of “free Chlorine” per liter of water. That is 1000 mg Cl2 per liter of water. That is (1000 mg / 71 mg) X 100 Coulombs = 1430 Coulombs. 7/8PDF Image | Electro-Clean Disinfectant Instructions
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