Chemical mixing in the exterior cleaning industry refers to the precise calculation and preparation of cleaning solutions — primarily sodium hypochlorite (SH), surfactant, and water. Correct mix ratios vary by surface type (roof vs. siding vs. concrete) and contamination level. Getting the ratio wrong risks damaging surfaces (too strong) or producing ineffective results (too weak). Digital calculators that account for SH concentration, batch size, and surface type eliminate guesswork.
A soft wash technician needs to mix a roof wash solution. They enter the SH concentration (10%), target strength (3%), and batch size (50 gallons) into the calculator, which outputs 15 gallons SH, 34.5 gallons water, and 0.5 gallons surfactant.
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