Superior Filtration: Crafted with durable Dacron paper for efficient water purification Easy Cleaning: Designed for simple weekly cleaning and monthly replacement Universal Compatibility: Suitable for all Intex PureSpa models Multi-Pack Convenience: Includes 6 filters for extended use Authentic Replacement: Genuine Intex Type S1 cartridges for optimal performance Keep your Intex PureSpa water clean and performing at its best by using genuine Intex PureSpa Type S1 Filter Cartridges. It is recommended that you replace your cartridges regularly to maximize your spa's perfomance. Intex PureSpa Type S1 Filter Cartridges - 6pk For maximum efficiency, clean the Filter Cartridges each week, and replace once a month or sooner. Works with all Intex PureSpa models Quantity: 6 Filter Cartridges