High quality OEM replacement filter cartridges from Intex keep your easy set or metal frame pool crystal clean & clear all season long. Constructed using Dacron filter material, Intex replacement cartridges are super easy to clean & maintain. For the best possible filtering results, it is recommended that you replace your Intex filter cartridge every two weeks. Designed for use in Intex cartridge filter pump models 28601 & 28602 used on the following Intex pools: 28125EH easy set ocean reef pool, 28111EH easy set pool, 28121EH easy set pool, & the 28201EH metal frame pool. Dimensions: 3-5/8" Outer diameter x 4" Long x 2" Inner diameter.