Seychelle pH2O Pure Water Filtration Bottle &ndash; Dual-chambered pH20 filter with Alkaline pH Enhancing Filter and Radiological Filter Increases the alkalinity (pH) of drinking water up to 9.5 pH with proven tested technology. Made in the U.S.A. NBCPrep exclusive: Custom carabiner clip included for easy carry and attaching to bag or pack. Removes up to 99.99% of toxic chemicals, contaminants, and pollutants. See list in product description below. Filter good for up to 100 gallons - or 757 bottles full. Easy to use 28oz bottle is BPA-free. Removes up to 90% of fluoride. The pH2O filter is dual-chambered and includes radiological filtering tested and approved by NELAC..