Fill the portable gravity flow eye wash/flush unit with clear water and add furnished additive to protect against bacteria, fungas, algae and acanthamoeba. Integral full flow nozzles are activated by pulling down on the bright safety yellow eye wash outlet tray. Swing tray up to storage position to stop flow. Funished with epoxy coated steel bracket for wall mounting. Unit can also be used on countertop or other flat surgace. Unit delivers .7 GPM for 15 minutes. Weighs 19 lbs. empty and 145 lbs. full.