How do you remove scale on a hot tub shell?

Scale can sometimes form on the spa surface, causing a gritty, sandpaper-like feel to the seats and walls. This is caused by poor water balance. (High Total Alkalinity, pH, Calcium Hardness, and/or water temperature.) To remove this, a light acid wash must be applied to the surface when the spa is drained. Check with the spa manufacturer to make sure this procedure is safe for the surface type.

To prevent scale buildup, use the recommended maintenance dose of SpaGuard Stain and Scale Control