Fluoride Removal: Can You Remove Fluoride By Boiling Tap Water

Fluoride Removal

One of the most common questions relating to fluoride removal is whether you can boil fluoride out of your water. The simple answer is no. If you boil water the fluoride will become more concentrated, remaining in the water as a fluorine salt.

The reason is that you’re not trying to boil out elemental fluorine, which is F2, but fluoride, F-, which is the ion. The boiling point of the fluoride compound is 19.5℃ for Hydrogen Fluoride and 1,695℃ for Sodium Fluoride, doesn’t apply because you’re not dealing with the intact compound. Trying to boil out fluoride is akin to boiling out sodium or chloride from dissolved salt in water, it won’t work.

Boiling to distil water to remove fluoride:

However, you can boil water to remove fluoride if you capture the water that is evaporated and then condense it; distil it. The water you collect will contain much less fluoride than the water you originally had. As an example, when you boil a pot of water on the stove, the fluoride concentration of the water in the pot increases. The water that escapes as steam contains much less fluoride, this is a very time consuming and ineffective method of removing fluoride. 

The most effective way to remove fluoride from water:

Simply put, the most effective method to remove fluoride from water is Reverse Osmosis: forcing water through a semipermeable membrane, leaving the fluoride and other ions on one side of the membrane, with higher purity water on the other side. The only water filters capable of removing fluoride are reverse osmosis systems, which purify the water eliminating contaminants to 0.0001 Micron. Our range of reverse osmosis water filters also re-introduce important minerals such as calcium and magnesium back into the purified water.

Methods that do not remove fluoride:

These methods do not remove fluoride from water:

  • As mentioned, normal boiling does not remove fluoride. It literally increases its concentration.
  • Most water filters don’t touch fluoride.
  • Freezing water doesn’t remove fluoride.
    Fluoride lowers the freezing point of water (freezing point depression), so ice from fluoridated water will be higher in fluoride purity than the source water, providing some liquid remains. Similarly, icebergs are freshwater rather than saltwater. The fluoride ion concentration is low, so using freezing to purify water is impractical. If you freeze a tray of fluoridated water into ice, the ice will have the same fluoride concentration as the water.

Fluoride removal is a very important factor in terms of water filtration which is often overlooked. An article highlighting the dangers of fluoride in our water can give people a better understanding on why fluoride removal is so important.