[Compatibility] This fluoride water filter is designed as a replacement for PF-2 elements and is compatible with various gravity-fed water filtration systems, including Big, Travel, Royal, Imperial, and Crown series. It ensures seamless integration for maintaining clean drinking water. [Food-Grade Safety] Certified by an authoritative third-party testing institution under the ILAC MRA agreement, this filter achieves a fluoride removal rate exceeding 90%. It provides cleaner and safer drinking water, offering peace of mind for those concerned about high fluoride levels in their water supply. [Primary Function] The main purpose of this white fluoride filter is to enhance water taste and quality. Note that it does not specifically reduce total dissolved solids (TDS) content. For optimal performance, each filter requires priming before use; detailed steps are provided in the product instructions. [Natural Filter Material] Made from Carbonate Apatite, a natural mineral synthetic material with up to 100% content, this filter offers enhanced safety compared to similar products containing alumina. It provides multiple layers of protection for deep purification, helping to safeguard your drinking water health. [Service Life] To maintain peak efficiency, we recommend replacing the fluoride filters every 1,000 gallons per pair. Actual lifespan may vary based on local water conditions and usage patterns. [Cost-Effectiveness] Why pay premium prices for brand names? This filter delivers comparable filtration performance at a more affordable cost. By choosing this option, you can enjoy high-quality water purification without overspending. [Additional Benefits] Easy to install and maintain, these filters are ideal for households seeking reliable water filtration solutions. They contribute to better-tasting water while being environmentally conscious through durable materials.