HotelSpa 1127 Dual-Cartridge 8-stage High Performance Shower Filter with Instant Side-Load Design. Enjoy 2X Filtration Power and Superior Water Flow Capacity for More Water Pressure! World's Most Powerful Shower Filter features Two 4-stage Cartridges and Patented Split-Chamber Side-LoadTM Design. 2X the Filtration Power of Ordinary Shower Filters! Enjoy Healthier, Younger-looking Skin with More Water Pressure and Instant Cartridge Loading! DOUBLE FILTRATION POWER! Other shower filters rely on just one 2-stage or 3-stage filter cartridge. Our revolutionary patented shower filter has TWO 4-stage cartridges that work together for greater filtration power! GREATER FLOW CAPACITY & WATER PRESSURE! Single-cartridge shower filters can reduce your water pressure as they clog over time. Our revolutionary Split-Chamber Design features two independent cartridges that function separately to prevent single-cartridge clogging. This insures consistent water flow and maximum water pressure over time. INSTANT CARTRIDGE REPLACEMENT WITHOUT DISCONNECTING SHOWERHEAD ASSEMBLY! With other shower filters, you must disconnect your entire showerhead assembly every time you want to replace the cartridge. Our unique Side-Load System makes cartridge replacement fast and effortless without disturbing your showerhead connections. Simply unscrew side caps and replace cartridges inside each chamber. SPACE-SAVING HORIZONTAL CONNECTION with SOLID BRASS ANGLE-ADJUSTABLE PIVOT CONTROL! Extends your shower arm by only 3 inches, less than most shower filters half its size. Improves convenience and versatility of your showerhead by adding 15 degrees to its angle range. UNIVERSAL FIT - woks with any Handshower, Shower Head and Shower Combo