What type of water is recommended to avoid issues with fluoride feed systems?

Using softened water is recommended to avoid issues with fluoride feed systems due to its chemical composition. Softened water has had calcium and magnesium ions replaced with sodium or potassium ions, which helps to minimize scaling and buildup in the feed lines and equipment used for fluoride addition. This is crucial because fluoride feed systems must maintain consistent flow and concentration levels to effectively manage the fluoride levels in drinking water.

In contrast, distilled water, while pure, may lack necessary minerals and can react differently than treated water when used in chemical dosing systems. Hard water contains higher concentrations of calcium and magnesium, which can lead to increased scaling and obstruction in the fluoride feed lines. Treated tap water may still contain variable mineral content that can cause similar scaling problems, depending on its mineral composition. Thus, using softened water ensures optimal functionality and longevity of fluoride feed systems.