What action should be taken when pool water hardness exceeds the recommended level to control scaling?

When pool water hardness exceeds the recommended level, diluting or replacing the water with lower hardness water is the most effective action to control scaling. High hardness levels, primarily due to elevated calcium and magnesium concentrations, lead to the formation of scale, which can adhere to pool surfaces and equipment. This scaling not only impacts the aesthetic appearance of the pool but can also lead to costly maintenance issues and equipment damage.

By replacing a portion of the high hardness water with water that has a lower hardness level, the overall concentration of hardness minerals in the pool can be effectively reduced. This method is straightforward and ensures that the water chemistry is brought back into the ideal range, promoting better water quality and a more enjoyable swimming environment.

Other strategies, such as adding chemical treatments or using acids, may address specific aspects of water balance but do not effectively tackle the root issue of excessive hardness. Similarly, while installing a water softener can help in some situations, it might not be practical or feasible for every pool setting. Therefore, replacing or diluting the water is the most direct and reliable method to manage high levels of hardness.