Contains one filter. 

• Fits ALL Water-to-Go bottles.
• Each filter provides 3 months of pure water (53 gallons/200 liters per filter)
• Filtering sediment heavy water will reduce filter life.
• Filters up to 99.999% of contaminants including viruses, bacteria, parasites, heavy metals, chemicals, pesticides, and microplastics.
• Not effective on sea water