[Perfect Fit]Compatible with all OB03 water bottles and water fountains, replaces OB03 standard water filter, excluding Mavea107007 water bottle. All manufacturer names and part numbers are for compatibility information only. [Better Filtration]BPA-free activated carbon and ion exchange resin filter layer effectively removes chlorine, mercury, copper, zinc, taste and odor while ensuring the flow of clean water. [Cost-Performance]Same performance as the original filter, but at a lower cost. Save up to 900 single-use 300ml plastic bottles. [Safe Drinking Water]IAPMO R&T is certified by NSF/ANSI 53 for material safety and drinking water safety. [Long Lifespan]Filters up to 40 gallons of water, replace every 2 months for optimal performance.