Plum Safety Eyewash 500ML pH N 4.9 Phosphate Duo* Bottles with a 4. 9% sterile phosphate buffer solution that quickly neutralizes acids and alkali. * They can be used individually or as refills in eyewash stations and boxes* The 500 ml bottle comes with the ergonomic DUO eyecup, which makes it possible to rinse both eyes at the same time.* 4. 9 % sterile phosphate buffer for neutralizing acid and alkali that come into contact with the eye* Easily manageable bottles* Ergonomic eyecups for effective