Fendall Sterile Saline Cartridge Refill For Pure Flow 1000 Eyewash Station is a preserved, buffered, pH balanced saline solution. Cartridge takes less than 5 minutes to install. Purified, contaminant-free, and physiologically correct saline solution from factory-sealed cartridges. Does not require costly plumbing. Provides a constant fluid flow rate and stream height for the entire 15-minute flushing period required by ANSI Z358.1. Factory-sealed cartridges last up to 24 months,* at least four times longer than other primary self-contained eyewash devices.