Three types of fluoride chemicals are used in drinking water treatment. These are sodium fluoride, fluosilicic acid and what other type?

Hydrofluosilicic acid solution

What is the SDWA Primary Contaminant MCL for Fluoride?

4.0 mg/L

Mottling of a persons teeth (brown staining) occurs at fluoride levels of what?

1.5 mg/L

What is a major cause of over exposure to fluoride?

Breathing fluoride dust

What are obvious signs of fluoride poisoning by ingestion?

Vomiting, diarrhea

Which statement about gravimetric feeders is correct?

The amount fed is measured on the basis of the weight of the chemical

If significant overfeeding of fluoride occurs, what should the plant operator do?

Shut down the plant, begin flushing affected water mains and notify local and state health officials

What factors must the design of a fluoridation system incorporate?

Methods of preventing overfeeding and backsiphonage

What is the Secondary contaminant MCL for Fluoride?

2.0 mg/L

What is the pH value of hydrofluosilicic acid (H2SiF6)

1.2