HydraPak 42mm Filter Cap - Water Filtration Accessory - Fast Flow - Perfect for Hiking, Endurance Sports, Camping, Travel, and Emergency PreparednessHIGH FLOW RATE: Access potable water anywhere. Filters approximately 1,500 liters of fresh water at a rate of >1 L per minute. SAFE: Effectively removes common waterborne bacteria (99. 9999%), and parasitic cysts (99. 999%) per EPA Guide Standards and microplastics (99. 999%) per NSF 42 greater than or equal to 3. 0 microns in size. EASY TO USE: The high flow drink nozzle is easy to open and lock with one hand, and is equipped with a dust cover that