Spas Hot tubs have come a long way since the ancient spas of Roman times. Today s hot tubs are usually small pools constructed of tile, marble, concrete, or fiberglass shell.
Water is heated and circulated through a pump and filter.
There are many reasons people like having a hot tub. The warm swirling water relaxes the body, reduces stress, and improves sleep. Pulsating jets of water soothe sore muscles. Hot tubs are also great centers of entertainment for family and friends. Hot tub owners must carefully balance chlorine and pH levels of the water to reduce the risk of water contamination.