Set metering dial for required dilution; concentrate and water will automatically be mixed at set rate up to 100 gallons. Metering dial selects from 16 mixing ratios; 1 teaspoon up to 10 tablespoons. Operates on water pressures ranging from 40 PSI to 60 PSI. Built-in anti-siphon device prevents back flow. Remove the deflector for solid stream coverage up to 30 ft.