What indicates an increase of dissolved solids due to evaporation in whirlpools and spas?

The presence of cloudy water in whirlpools and spas can indicate an increase in dissolved solids due to evaporation. As water evaporates, it leaves behind minerals and contaminants that were dissolved in it. These can accumulate and lead to a cloudy appearance. Cloudiness often suggests that the water chemistry is out of balance, which can result from the concentration of substances as water is lost to evaporation.

In contrast, increased water temperature can accelerate evaporation but does not directly indicate dissolved solid concentration. Foamy water typically points to the presence of surfactants or organic materials rather than dissolved solids from evaporation. Condensation, while related to moisture in the environment, does not directly correlate with the water quality or concentration of dissolved solids in whirlpools and spas. Thus, cloudy water serves as a more direct indicator of the changes occurring in the water chemistry due to evaporation.