Physiologically balanced to match natural tears and aid in reducing additional damage to the injured eye when flushed properly. Specifically formulated to be mixed with clean, potable water (10:1 ratio) and provides a cost-effective solution for the eyewash refills. May be used with Porta Stream? I, II & III (sold separately). The 180 oz. bottle makes 14-16 gals.; 70 oz. bottle makes 5-7 gals.