Efficient, Reliable Filtration: Combining resin with high-quality activated carbon, this filter reduces 93% of fluoride in water, Tested & verified by independent laboratory testing, making your water harmless and safe for drinking. It also reduces residual chlorine and ensures a better taste.Compatible models: You can use this product with the GLACIER FRESH’s King Tank Gravity-Fed water filter and replacement for Berkey Gravity-Fed Water Filter System , including Big, Travel, Light, Royal, Imperial, and Crown series, with no leakage. The water filter is not sourced by or sponsored by Berkey. GLACIER FRESH is an independent brand.Good Quality Materials: The food-grade fluoride reducer contains resin and granular activated carbon. This, alongside the BPA-free housing, provides clean and safe water for your household at all times.Cost-Effective Option: Producing up to 1,000 gallons of filtered water per pair, this filter saves you up to 3,800 bottles of bottled water. It is a sustainable and safe option.Seamless Installation: Once you have connected the replacement filter for black carbon and fluoride filters, you can rest assured of real-time delivery of clean and healthy filtered water.