[Filter Compatible Models] Our swimming pool filter type S1 is compatible with all models including 28403E, 28407E, 28443E, 28453E, 28421E, 28423E, and 28413E. [Powerful Filtration Performance] Premium quality dacron fabric collects hair, leaves, dust, sediment, sand, and other debris; easy to clean and replace. The S1 hot tub filter is installed inside the filter pump and captures dirt as it passes through the system. [Easy To Clean] Our type S1 replacement spa filters feature extra plastic and quality Dacron paper pleats. These spa filters for hot tubs are easy to clean, allowing for repeated use. Enjoy clean water in your pool. [Warm Tip] It is recommended to change the spa filter regularly to maintain filtration efficiency. Replace every 2-3 weeks to keep the water clean. Provides a larger filter area for higher efficiency, toughness, resistance to dilute acid, fine filtration, and strong dirt absorption ability. [Powerful Filtration Performance] The filter effectively removes hair, leaves, dust, sediment, sand, and impurities. Provides clear and clean water, allowing you to easily enjoy a well-maintained pool. Colour: blue Material: PET + non-woven fabric Size: 107 x 74mm Package Contents: 6 x Inflatable pool filter Only the above package content is included; other products are not included. Note: Light and display differences may cause slight color variation between the image and the actual item. Measurement error is +/- 1-3cm.