Saline is physiologically correct, buffered to the eye and delivered from factory sealed cartridges. No costly plumbing required. Integral reservoir captures waste fluid. Stop valve allows easy draining of reservoir after use. Cartridges have a two year shelf life:sold separately. Provides a constant ribbon fluid flow rate of 0.4 gpm for the entire 15 minute flushing period required by industry standards. Meeets ANSI Z358.1-2009. 29" x 18" x 31" 38lbs