The 621HC Mixing Station has a water flow rate of 6 GPM @ 40 PSI and is a "high concentrate" chemical proportioner for quickly filling larger sized containers and equipment with strong solutions. This venturi injection system uses city water pressure (40 - 80 PSI) to draw and blend a high concentration of chemical into the water to create up to 1:1 dilution ratios. Ball valve activation allows for hands-free dispensing.