Which type of fluoride chemical is recommended for use in downflow saturators?

Crystalline sodium fluoride is recommended for use in downflow saturators because it has the appropriate solubility and particle size suitable for this type of application. In downflow saturators, water flows downward through a bed of fluoride, where it is critical that the fluoride dissolves effectively and mixes uniformly with the water. Crystalline sodium fluoride tends to dissolve efficiently in water, allowing for consistent fluoride concentration in the treated drinking water.

Moreover, the physical properties of crystalline sodium fluoride, including its flow characteristics and ease of handling, make it especially suitable for automatic feeding and controlled dosing in treatment facilities. This ensures that operators can maintain the desired levels of fluoride in the drinking water supply reliably.

Other options may not offer the same level of efficiency, solubility, or optimal particle characteristics for use in downflow saturators.