For the very best in Swim Spas for Marin, Sonoma and Marin counties, you must strongly consider the Dimension One Spas AFS series (AquaFit System). Four great models to choose from. One 13 feet, one 16 feet, and two 19 feet long (PRO & PLUS) exercise swim spas available. Each with a STANDARD 6 Gauge steel frame with lifetime warranty – Best in the industry. Full-foam urethane commercial grade refrigerant insulation for the lowest energy consumption in the industry. The most durable sunshine prrof interior shell material available called DuraTex. Same material used on cruise ships and luxury yachts. STANDARD 24 hour silent circulation pump filtering 10,000 gallons of water a day with a patented Advanced water management system called Ultrapure ozone system with Vision Mineral Cartridge purification for significant Chlorine reduction and crystal clear water. 4-6 very powerful swim jets. And strategically located mounting points for attaching resistance bands, row bars and swim tether.