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Step 12. After delivering the desired number of Coulombs (in this case 11,000 Coulombs delivered in 25 minutes), turn OFF the SMPS. Remove the rods assembly from the bottle. Rinse all wet parts with fresh water and dry them (with a dry cloth or paper towel). Keep the assembly and other parts to use again. Picture for Step 12. Showing a current of 7.3 Amps. Assuming this was the average value, then (7.3 Amps X 25 minutes X 60 seconds =) 11,000 Coulombs were delivered to the water in 25 minutes.. The current through the system may fluctuate by about 10% during the experiment, so we need to estimate the average current. Photo credit: Vijay Matange Step 13. Dilution. In a large plastic bucket or container, combine drinking water with the solution in the bottle. If you delivered 11,000 Coulombs, then you have 1L of a 1000 ppm HOCl in the bottle. Mixing it with 3 L drinking water will produce 4 Liters of dilute HOCl solution of about 250 ppm HOCl. Step 14: Removal of small carbon deposits. The process of electrochemical generation of HOCl with a carbon electrode leads to slow degradation of the electrode. Small carbon particles get released into the liquid. They can be removed by filtering through a coffee filter, or just letting them settle to the bottom (this may take time). We have confirmed that passing the HOCl concentrated solution through a paper coffee filter does not reduce the HOCl concentration. (You may choose to use two nested paper filters if needed, based on how fine the carbon powder is). The resulting solution should be clear and transparent, with a mild smell of chlorine. pH ADJUSTMENT, STORAGE, AND USE To adjust the solution pH: Using a pH paper strip (or a pH meter), adjust the pH of the solution to a value between 5.0 and 6.5. Adjusting the pH will increase the disinfecting power of the solution by 60 to 100 times. First, use a paper test strip to determine the initial pH of the solution. The amount of acid to be added will depend on the dissolved salts in your local drinking water, which vary from place to place, and can also shift seasonally. The acidity in vinegar can vary as well. We recommend doing this measurement once a month, or every time you change the source water or vinegar source, to catch any changes in the underlying chemistry. We expect that about 5ml vinegar per 1000 mL will be enough. 6/8PDF Image | Electro-Clean Disinfectant Instructions
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