Delivers final solution with adjustable concentration. Proportional pump maintains constant concentration in variable water flow. Compact design, easy to operate. Adjustable and accurate concentration levels. Unaffected by changes in water pressure flow. No electricity or wiring required. On-demand dispensing eliminates chemical waste. Easy to install, one water connection required and 20 in x 30 in of wall space. Additional models available for a wide range of applications: Low Concentration: 2 – 20 ppm; Standard Concentration: 10 – 150 ppm; High Concentration: 10 – 150 ppm; Dual Concentration: delivers both low concentration (2 – 50 ppm) and high concentration (10 – 150 ppm) ranges.