An 18 foot swim spa is the closest you can get to a backyard lap pool without the cost and upkeep of one. The extra length produces a longer, smoother swim current that suits serious swimmers and triathletes, and the generous footprint leaves plenty of room for aqua fitness, resistance training and family use at the same time. Dual zone models go a step further, letting you keep the swim area cool while a separate spa section stays hot for hydrotherapy. Compare the Commander F-1655, Commander-X F-1655X and dual zone Olympian F-1868DZ below, with seating for up to 12 and jet counts from 33 to 73. Visit Spas Unlimited Houston, Tomball or Richmond showroom for a private test soak, and let our team advise you on electrical requirements, pad preparation and delivery access. Every swim spa we sell is backed by our in-house service, parts and delivery departments.