The Stennicator Pump is used primarily to treat water with sanitizers,disinfectants, nutrients and medications. The pump injects at a fixed rate of 1oz/gal for water flow rates up to 2.7 GPM (162 gal/hr) at pressures up to 80PSI. It is actuated with a signal sent from a dry contact water meter (not included). Water meters wired to a house controller to tally water consumption are suited activate the Stennicator, which has an internal signal splitter.There are 3 settings to be used with water meters - a 1 pulse/gal (ppg), 10 ppg and 1 ppl (Liter). The pump also has a prime mode and a stand-by mode. A second pump can be added to accommodate flows up to 5.4 GPM (325 gal/hr).