COMPATIBLE FILTER MODELS---Replacement 29001E filter cartridge.Works for PureSpa pool including 28403E, 28407E, 28443E, 2845Z3E, 28421E, 28423E, 28413E, and 28453E. LONG SERVICE LIFE---Unique folding Fabric Structure make it easier to capture large volume of contiminants. It is also easy to wash/clean to recondition the filter. This filter lasts for 1-2 years when proper maintenance is performed. We are committed to providing the best quality at good price. HIGH-EFFICIENCY FILTER PERFORMANCE---This filter cartridge used Innovated "Dirt-Locking" technology, which makes the fabric traps much more contaminants than regular fabric, keeps your swimming pool clean for a long time.This filters Cartridge efficiently removes hair, leaves, dust, sediment, sand, etc. SIZE AND SPECIFICATIONS---Suitable for , for , for Sundance, for Saluspa, for , Type S1 filters( outer diameter 4.2 inches , inside diameter 1.65 inches , height 2.8 inches). EASY CLEANING---Replace filter cartridge with a new one every two weeks for maximum efficiency, easy to clean when necessary, Scrub with a Cartridge Cleaner Tool, then wash under a strong water pressure to remove loose particles from the filters fabric,which can maximizing your spa's performance. Material:PET+non-woven fabric colour:White + Blue Package Contents: 10 x Filter Cartridge S1 Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.