Abstract: A convenient, easy-to-use, water-saving, and labor-saving FROG irrigation controller and system are provided, which determine the appropriate water budget and schedule for the property's landscaping based on evapotranspiration data for the geographic area, regulation data (mandated and voluntary watering restrictions), and property-specific data (such as type of plant, zone number, emitter type, and plant environment), with consideration given to reduction in watering days, increase in soil watering depth, and day of year. Once set, the FROG provides incremental adjustments over the course of the year; the homeowner no longer needs to re-set the watering program seasonally to comply with local mandated and voluntary watering restrictions. Compliance is automatic and obligatory, meeting the water saving goals of the local water authority.

Abstract: An injection system includes an injector pump delivering a mixture of polymer and water from a mixing tank. Optionally, a surge tank is provided to reduce pressure hammer effects. The mixture is delivered by the injector pump to a manifold device that includes a commutator valve receiving the mixture through an inlet and discharging the mixture through two or more outlet ports. An actuator controls the flow of the mixture through the commutator valve to create pulses in the mixture. Optionally, the actuator is controlled by a controller. The mixture is delivered from the outlet ports to nozzle arrays.