What type of feeder is used to add dry fluoride to water?

A volumetric feeder is the appropriate type of feeder for adding dry fluoride to water because it precisely measures and delivers a specified volume of the substance into the water stream. This is important in water treatment processes, particularly for fluoridation, where maintaining an accurate dosage is crucial to ensure compliance with health regulations and optimize the benefits of fluoride without exceeding safe levels.

Volumetric feeders typically utilize mechanisms such as augers or screw conveyers, which allow for controlled and consistent feeding rates. This results in effective mixing and ensures that the fluoride is evenly distributed in the water supply.

Other feeder types, while useful for different applications, do not provide the same level of precision required for dry fluoride addition. Gravitational feeders rely on gravity and may not allow for precise control. Hydraulic feeders use liquid pressure to move materials, which is not applicable for dry substances like fluoride. Pneumatic feeders rely on air pressure to convey materials, which can lead to inconsistencies when dealing with fine powders. Therefore, for the purpose of accurately adding dry fluoride, a volumetric feeder is the most suitable choice.