FIBERTECH BEAM CONSTRUCTION Innovative FiberTech Technology offers superior structural stability while maintaining a comfortable surface for a luxorious and refreshing spa experience HARD WATER TREATMENT SYSTEM Builtin Hard Water Treatment System makes water gentler on skin, clothes and the entire spa system; hard water buildup limits water flow and reduces the life of your spa HEATED AIR BUBBLE TECHNOLOGY The Positive Temperature Coefficient PTC heater is designed to maximize heat transfer to the water, while ensuring the highest level of safety, performance, and longevity ENERGY EFFICIENT SPA COVER High density thermalresistant foam provides extra insulation and minimizes heat loss; this cover enhances the Spa performance while improving the energy efficiency by as much as 50 SPECS Designed to fit up to 4 people; outer dimensions 77 x 28 and inner dimensions 57 x 28; water capacity of 210 gallons; water temperature range 68104 degrees Fahrenheit