How much is .7 ppm?

Experts we spoke with say .7 parts per million amounts to about a drop of liquid in 15 gallons of water. So, if you filled a standard bathtub (~45 gallons) with water, fluoridating that water with .7 ppm would be like adding three drops of fluoride concentrate.
kwch-jab-how-much-is-7-ppm-20121026

( October 26, 2012 )

Experts we spoke with say .7 parts per million amounts to about a drop of liquid in 15 gallons of water. So, if you filled a standard bathtub (~45 gallons) with water, fluoridating that water with .7 ppm would be like adding three drops of fluoride concentrate.

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