Hot Spring Spas Tri-X Spa Filter for Grandee Part Number: 73178 (5 pack) Filter is designed to fit the following hot tubs and spas: Grandee 1991-Current, Vista 2004-2013 Envoy 2004-Current, Vanguard 2001-Current, Grandee NXT 2014-Current, Envoy NXT 2014-Current, Jetsetter NXT 2014-Current, Jetsetter 1991-Current, Prodigy 1991-Current, Sovereign 1991-Current, Alccolade 2005-2006, Landmark 1997-2003, Aria 2007-2015 and Highlife ILE 2003. This filter can replace the 71825 filter in all 1990-current Hot Spring spa models, 1998-2002 Hot Spot models and all Solana X, RX, SX & TX spa models. No matter the model of your spa or hot tub, or when it was made - it's important that you regularly change your filter to prevent bacteria build-up. Choose from our selection of hot tub filters to find the right replacement hot tub filter for your spa - at the right price! No matter the model of your spa or hot tub, or when it was made - it's important that you regularly sanitize and treat your spa to prevent bacteria build-up. Choose from our selection of hot tub filters and maintenance products to find the right hot tub sanitizing system for your spa - at the right price! The unique design enables it to filter twice the water per minute than a common filter. You dont have to clean it as often either!