Fangrui Product Details [filtration Precision Up To 1 Micrometre]: In Order To Ensure Excellent Filtration Performance, This Filter Elements Uses High-quality Coconut Shell Activated Carbon As The Filter Material, With A Filtration Precision Up To 1 Micrometre. Efficiently Removes Various Impurities Such As Sand, Rust, Sediment, Odor, Etc., While Effectively Absorbing Residual Chlorine, With A Removal Rate Of More Than . [compatible Models]: The Filter Can The For Berkey Bb9-2 Water Filter. Compatible With For Berkey Gravity Filtration Systems Including Travel, Grand, Royal, Imperial, And Crown Series. The Precision Design Of The Washers And Wing Nuts Ensures A Secure Connection And Prevents Leakage. No Primer Required, It Can Be Installed And Used After , Saving Early Flushing Work. No Low Traffic Issues. [durable Lifespan]: To Extend The Life Of Your Device And Get The Performance, We Recommend You The Filter Every 6,000 Gallons (depending On The Quality Of The Tap Water You Filter). Please