Wiki Page, Community Fluoridation: Module 4 - Water Fluoridation Equipment Part 1

Wiki Page
2017-06-27T12:18:54-06:00

Dry Feeders

Dry feeders use unsaturated solutions of either sodium fluoride or sodium fluorosilicate (NaFS), on either a volumetric or a weight basis and are then added to water in a mixing tank at below saturation dilution. The unsaturated flow is then added to the water stream. If a community desires to use a dry additive, then a dry feeder will become increasingly more cost effective as the size of the population served increases due to reduced labor costs.

Typically, a small feeder system can cost around $25,000 while medium systems can cost between $65,000 to $225,000.

From the CDC:

Dry Fluoride Feed Systems

1. A solution tank that has a dry feeder (both volumetric and gravimetric) must be provided.

2. Solution tanks should be sized according to CDC guidelines (31).

3. A mechanical mixer should be used in every solution tank of a dry feeder when sodium fluorosilicate (i.e., silicofluoride) is used.

4. Scales must be provided for weighing the amount of chemicals used in the dry feeder.

Now, it's time for a quiz! Click next on the bottom for Module 4 - Quiz 1.