With the Revolution Injection Sprayer you simply dial a large, easy-to-read knob to set the dilution rate from ratios of 1:4 to 1:64. This allows you to use the Revolution Sprayer for virtually every spray-applied chemical in your van and increase or decrease chemical concentration on the fly as cleaning conditions require! Now you, the professional, decide your mix ratio on prespray; heavy for heavy soil, light for light soil. You won't need constant high concentrations when only a small portion of the job requires it. When you come to that grimy area in front of the couch, turn the knob higher for higher concentrations of cleaner, turn it lower for light soils.