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Plum Duo pH Neutral Sterile Buffer eyewash solution 16.8 oz (500ml) bottle #45900 essential for acid, alkalis and chemical Incidents to the eye, pack of 2 bottles. With the Plum patented Duo eyepiece for rinsing both eyes at the same time with an even, gentle and concentrated rinse. pH Neutral is a 4.9 % neutralizing phosphate buffer, proven to be effective when applied immediately after an incident involving acid or alkali. In the event of an incidents involving acids and alkaline substances the chemical should be neutralized as fast as possible to a safe pH level to minimize eye damage. A buffer provides this compared to saline or saline which gives dilution so a longer rinse time is required. This essential pH Neutral solution should be placed in locations in your workplace where chemical eye hazards are present. Refill for item Plum units #48108, #45572 & #5171 . Bottles have a 3 year expiration.