Self-contained eye wash and/or drench hose units are ideal where a continuous supply of portable water is not available. These units may be used in low traffic areas, low hazard areas or where installation of plumbed equipment is not cost effective. Ten gallon units provide approximately 8.3 usable gallons (31.4 liters) of water and fifteen gallon units provide approximately 12.8 usable gallons (48.5 liters) of water for effective rinsing of eyes, face or body. Eyewash meets ANSI Z2358.1 primary. Note that, under ANSI Z358.1-2004, drench hose units supplement but do not replace other types of emergency equipment.