Standard 2" x 10" Fluoride Inline Filter Cartridge. Reduces fluoride to less than 0.5 ppm. Contains fine-mesh pre-resin media to reduce fluoride that may be present in an untreated water source. This media cartridge is a high capacity synthetic absorbent media (Synthetic Aluminum Oxide, also known as Activated Alumina), which is highly selective for Fluoride, Arsenic and Lead. It is manufactured to hold a minimum of fines and other foreign matter. Filters are designed to remove contaminants through a combination of absorption and chemical reaction. It has the same particle size as ion exchange resin. *For best results, do not exceed recommended flow rates and pH conditions: For influent streams above 100 ppm hardness, reduce cartridge fluoride removal capacity by 50%; Above 200 ppm, reduce capacity by 75%. Filter media is locally manufactured (California, USA) and certified to NSF Standard 61. The cartridge is capable of water flow rates up to 2.5 gallons per minute, but optimum performance is achieved at 0.5 GPM (gallons per minute). Be aware that the higher the flow rate, the less fluoride will be removed from the water. Fluoride Filter Cartridge Features: Capacity (<100 ppm hardness): 4500 ppm (average 1000 - 1500 gallons) Design Flow Rate (Nominal): 0.25 GPM pH range: 4-10, optimum performance at pH 5 Max Temperature: 100°F (38°C) Minimum Temperature: 40°F (5°C) Max Pressure: 125 PSI (8.6 bar) Minimum Pressure: 20 PSI (1.4 bar) Micron Rating: 25 Nominal Filter Dimensions: 10 x 2.5 inches Cartridge Life: 1 Year