Guest guest Posted October 25, 2010 Report Share Posted October 25, 2010 Hello Premiergifts, They closed off the spaces, or houses, and sprayed in chlorine dioxide gas. You can approximate that by using hydrochloric acid to activate, then diluting to the concentration needed. You then load that mixture into a fogger and fog the area and let it soak for a few hours before opening it up. After you have killed the mold, you can then go back and clean everything up to remove as much of the mold as possible, then you can fog again with an a solution using citric acid to activate. This will leave a residual that will continue to work keeping the mold from re-occurring. The first solution would need around 60 PPM free chlorine dioxide. Depending on the size of the room, 1 - 2 liters of solution should be all that is required. After fogging, you need to keep the room closed for a couple of hours to let the chlorine dioxide work. To make 1 liter of 60 PPM concentration, put 2 ml of 5% sodium chlorite in a glass and add 2 ml of 6% HCl. Add enough water to make a total of 1 liter. The second solution would need about 600 PPM available chlorine dioxide with about 60 of that as free chlorine dioxide. 1 liter should be plenty for most rooms. With this solution you fog, air out and go on with your normal routine. The residual will dry on exposed surfaces and will come to life as the humidity increases and mold and mildew try to come back. This application will be effective for many weeks, depending upon weather conditions. Under demanding conditions, it will last 6 - 8 weeks. Under less demanding conditions it can last 24 weeks, or longer. To make 1 liter of this solution you would put 20 ml of 5% sodium chlorite in a glass and add 20 ml of 10% citric acid. Swirl to mix and let the solution activate for 10 minutes. Next, add enough water to make 1 liter total. General cautions include safe chemical handling, and avoid breathing the fumes. You should probably remove plants and pets from the rooms you are treating while you are treating them. After you air things out, the plants and animals should be fine. If there is a lot of hidden mold, you will notice a chlorine dioxide odor every time the humidity raises. If this happens, the best thing to do is to figure out where the mold is and remove it. If that is not possible, additional fogging will be necessary. The amount needed will be directly related to the amount of mold hidden away. The goal is to end up with no odor at all. We have had some cases where we ended up using a 30 day time release packet and it took several months before everything returned to normal. Tom > > I read somewhere that they used Chlorine Dioxide after hurricane Katrina > to kill mold there. Anyone know the proper mixture to use to kill black mold in building materials like they did in Katrina. Thanks > Quote Link to comment Share on other sites More sharing options...
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