1 X Carbon Filter for AquaSpirit 5.0 and 7.0, AlkaH2o, KE501, KE701 Replacement Filter for Aqua Spriit 5.0 and Aqua Spirit 7.0 Water Ionizers Also for use in KE501, KE701 and AlkaH2o Water Ionizers Contains Activated Carbon for Long-Life Measures 7.5" tip to tip; 2.25" Diameter