Let your worries bubble away as you unwind in the Intex PureSpa Inflatable Hot Tub with Filter Cartridges.The PureSpa provides relaxation at the touch of a button for up to 4 people with its easy-to-use control panel that activates 140 high-powered bubble jets surrounding the interior of the spa for a refreshing massage. This particular PureSpa also features built-in LED lighting, headrests, and a built-in hard water treatment that system stops calcium buildup to keep your spa time comfortable. Set up is easy and ready for water in just about 20 minutes. Package includes tub, insulated cover, heating/filtration/air blower/hard water system, color-changing LED light, 2 filter cartridges, 2 headrests, thermal ground cloth, inflation hose, carry bag, floating chlorine dispenser, and test strip.Keep your spa water clean and Intex PureSpa performing at its best. This is the authentic replacement cartridge for your Intex PureSpa. It works with all Intex PureSpas models including 28403E, 28407E, 28443E, 28453E, 28421E, 28423E, 28413E, and 28453E. Replace your filter cartridges regularly for the best results. It is recommended that you replace cartridges every 2 weeks to maximize your spa's performance.Stay back and relax with the Intex PureSpa Inflatable Hot Tub with Filter Cartridges.