Surface Problems

Surface Discoloration

Surface discoloration in spas usually indicates the presence of metals, or, for fiberglass spas, cobalt staining. Use of a stain and scale control product will remove some fresh stains. If, however, the stains have been present for a long period of time, it may be necessary to drain the spa and perform a light acid wash. If the spa is fiberglass, cobalt staining can be temporarily faded by an application of oxalic or citric acid. Usually, the discoloration will reappear. This has to do with a problem within the fiberglass itself, and there is no way to prevent its return.

Scale Buildup

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 spa cleaning solution and a non-abrasive brush may be used to clean the spa. In some cases, 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 a stain and scale control for spas.

Scum at the Waterline

Hot tubs often get an accumulation of scum and other oils around the waterline due to the number of bathers. The hot tub should be shocked often to avoid the accumulation of this waste. Once it occurs, however, it can be removed with a surface cleaner designed for use with spas or with a weekly addition of a natural enzyme.