WATERWAYS 50 SQUARE FOOT INLINE CARTRIDGE FILTER FOR SPAS OR SMALL POOLS. Includes a reuseable and cleanable filter cartridge. Applications – spas and small pools. Features internal bypass 1.5 pvc unions with gaskets reuseable and cleanable filter cartridge. The item “Waterway Inline Spa Cartridge Filter 50 sqft with Unions 500-5070″ is in sale since Thursday, December 02, 2010. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs”. The seller is “thepoolman” and is located in United States. This item can be shipped to United States.