Aqua2use(300)Water Wise Group. The Aqua2use greywater system collects water from the shower, laundry, lavatory sinks, and bath and channels it through a four-stage filtration system into a 21-gallon tank to create water suitable for outdoor irrigation. The system’s control box automatically triggers the pump when the tank is filled to distribute the water to irrigation lines. The reusable filters have a 15,000-gallon capacity and should be cleaned every four to six months, the company says. 805.468.4920.