[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-durable 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, replacing every 2–3 weeks to keep the water clean. Provides a larger filter area, higher filter efficiency, toughness, resistance to dilute acid, fine filtration, and strong dirt absorption ability. [Powerful Filtration Performance] The powerful filtration performance 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 different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allowed error is +/- 1–3cm.