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Original factory filter cartridge (aka filter element) made exclusively for Hot Spring factory and fits all 1990-2012 Hot Spring (Vista, Envoy, and Aria use the 73178 only), all 1998-2002 Hot Spot spas and all Solana models. This filter is made from a different polyester material than generic filters to allow more gallons per minute flow per square foot of fabric. Use the "Check Serial Number Compatibility" tool below to confirm that this OEM filter replacement is correct for your spa. Note: 31489 is stamped on one end of this filter.