In the pressure washing business we use sodium hypochlorite (or SH / bleach) in 10% and 12.5% concentrations. Is there a simple formula to determine amounts of SH to water to reach a desired concentration for a given volume? For example, I am using 12.5% SH and need a 50-gallon batch of solution with a 1% concentration of SH. I also need a 30-gallon batch with a 6% concentration. What formula would I have to use to get this right every time regardless of the volume or desired concentration?
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