Spas and hot tubs can now enjoy the same benefits of saltwater chlorination that millions of swimming pool owners have experienced for decades. Spas typically have higher usage and warmer water temperatures than swimming pools, so salt systems for spa-use are made to perform under higher demands. For very large hot tubs, many people will choose to install full-size saltwater chlorinators often used on small swimming pools, in order to ensure that the spa's demands are met.