Service - Hot Tub GOLDIt is recommended every year to ensure maximum performance. Spa must be full of water on arrival: SPA FLUSH is added to water to clear pipes, SPA SHOCK and ANTI Scale is then added shortly after your pipes will build up a layer of calcium, dirt and Body Fats which will continue to build up and reduce the power of water flow. These chemicals will help to loosen and break down the build up in the pipes before emptying the spa. Filters are removed and