?????REPLACEMENT FILTER?–Compatible with 4CH-949, PWW50L, Cal Spa fil50-5d13h15fct-3, barefoot spa 50, Rising Dragon, Dynasty Spas, FC-0172. Note: The manufacturer’s name and part number have been used for reference purposes only. Savener is an independent brand. ?????SIZE?–Length: 13-1/2"?Outside Diameter: 4-15/16"; Top: v-groove semi-circular handle; Bottom: 2" female SAE thread; Filtration Area: 50 Sq.Ft. ?????NSF/ANSI 50 CERTIFIED SAFETY?–Savener pool and spa filter is tested and certified by IAPMO against NSF/ANSI 50 standards for material safety. All components are proven safe for long-term water exposure, ensuring no harmful substances are released.Protect your family’s health and enjoy cleaner, safer pool and spa water. ?????TRILOBAL FILTRATION & DURABLE ABS END CAPS?–Made with Thickened innovative trilobal fiber and Reinforced ABS end caps.Structure provides three times the adsorption surface area compared to conventional filter fabrics. It captures more dirt and sediment while maintaining consistent water clarity, even under frequent use—so you can enjoy crystal-clear water all day long. ?????PROFESSIONAL DIRT-LOCKING & MICRON-LEVEL FILTRATION?–Our exclusive Dirt-locking structure efficiently captures debris and makes cleaning effortless. Upgraded with a 50-micron high-efficiency filtration layer, it effectively removes up to 99% of fine particles such as hair, leaves, dust, and sand. It keeps pool water sparkling clear for longer. ?????EASY TO CLEAN?– We suggest to rinse your pool filters regularly with clean water, this will help remove dirt and protect your filter material. With regular cleaning, the filter also needs to be replaced regularly to make your pool filter work more efficiently. ?????GUARANTEED &TRUSTWORTHY?– Savener pool and spa filters is a company with domestic production, warehousing and office space. Save big with superior pleat material, end caps and max flow cores compared to other pool and spa filters. 1-Click Buy, Add-to-Cart or sign up to Subscribe & Save to get the best price! ???NOT FOR BACKWASHING?– This filter cartridge is not designed for backwashing. Backwashing may cause cracks or permanent damage. ??SIX-MONTHS RETURN?– Six-Months Return Policy Guaranteed if the products are with any quality shortages! We attach great importance to all customer's perfect experience of our products. And we are equipped with professional service to provide technical support for every customer.