Hot Tub Compatible With Sundance Spas Filter Cartridge HTCPSD6473-164S/6473-164SHot Tub Compatible With Sundance Spas Replacement Jacuzzi Sundance filter for specific Sundance spa models. Micro Clean Ultra Fits all 2009+ 880 Spas. Engineered as the Industries 1st Interlocking System to Provide Dual Filtration Resulting in the Purest Water. The Outer Core Traps Large Particles, While the Inner Core Traps Ultra Fine Particles. This is for one piece Sundance Inner Core Filter Cartridge Hot Tub Compatible With Sundance Spas This is