No Scale will prevent and remove lime scale from your spa internals and surface. No Scale will remove scaling from your heater element. No Scale will prevents issues with internal components due to built up deposits of lime scale, which can also be a breeding ground for bacteria. Scale can build up quickly on a Hot Tub/Spa due to the relatively high water temperatures. No Scale should be used as a weekly preventative measure. We recommend using this whether or not you live in a hard water area.