THESE PURE FLOW 1000 EYESALINE REFILLS ARE SEALED CARTRIDGES THAT ARE DESIGNED TO ELIMINATE AIRBORNE PARTICLES THAT CONTAMINATE FLUID. THE CARTRIDGES INCLUDE AN INTEGRAL NOZZLE AND HOSE TO ENSURE 15 MINUTE DELIVERY OF CONTAMINANT-FREE EYESALINE SOLUTION FOR EYE CARE. THESE SALINE CARTRIDGES ARE FOR USE WITH PURE FLOW 1000 EYEWASH STATION (MODEL 237680). FEATURES SET OF TWO 3.5 GALLON HONEYWELL SALINE SOLUTION CARTRIDGES STANDARD PH-BALANCED STERILE PH-BALANCED HIGH HUMIDITY SHELF LIFE OF 24 MONTHS