Equinox Spas EQ744B-SMG 88" x 88" x 38" 7 Person 44 Jet Spa Sterling Marble Interior/Grey Exterior. Every Equinox spa starts with a solid foundation. The polyethylene floor seals out critters and moisture while sealing in the heat. Integrated into the sealed floor is our galvanized steel frame. Engineered to provide the strength and stability required to support over 7000lbs. Unlike wood frames, our galvanized steel structure is built to last. Not only is it 10 times stronger than wood, it will not crack, warp or rot and unlike wood it will not sustain termites or rodents.