Fend-all Emergency eyewash Refill Cartridge for Flash Flood eyewash station delivers a buffered, saline solution superior to tap water for emergency eye care. Sealed cartridge contains 1 gallon of preserved and pH balanced Sperian saline solution. 1 gallon Eyesaline cartridge is easy to store and provides quick changes without mixing or measuring. Shelf life is determined by the date of manufacture and always checks the product's expiration date.