Add 100 g of AgNO3 crystals (RDIC buys crystalline AgNO3 with a purity of about 99.8%) to 500 ml of deionized water and mix well Add 1000 ml of deionized water to the solution and mix for 1 minute. Store this concentrated silver solution in a light-resistant plastic container. To make the silver solution, take 100 ml of the concentrated silver solution and place it in a light-resistant container. Add 18 litres of distilled water and mix. 18.1 L gives enough solution for about 60 filters. (Note: The containers should be kept closed because the silver in the solution oxidizes when exposed to air.) ~ 47 mg or about 200 ml of solution is applied inside the filter to the using a brush. ~ 23 mg or 100 ml of solution is applied to the outside of the filter Allow the filters to dry for a few hours.
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