Making Distilled Water

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Distilled water is produced by a process of distillation, and has an electrical conductivity of not more than 10 S/cm and total dissolved solids of less than 10 mg/liter.
Distillation involves boiling the water and then condensing the vapor into a clean container, leaving solid contaminants behind.
Distillation produces very pure water.
A white or yellowish mineral scale is left in the distillation apparatus, which requires regular cleaning.
Distillation alone does not guarantee the absence of bacteria in drinking water unless containers are also sterilized.
Double-distilled water (abbreviated "ddH2O", "Bidest water" or "DDW") is prepared by double distillation of water.
Historically, it was the de facto standard for highly purified laboratory water for biochemistry,
and trace analysis until combination methods of purification became widespread.

For many applications, cheaper alternatives such as deionized water are used in place of distilled water.
Deionized water, also known as de-mineralized water (DI water, DIW or de-ionized water), is water that has had its mineral ions removed,
such as cations from sodium, calcium, iron, copper and anions such as chloride and bromide.
Deionization is a physical process which uses specially-manufactured ion-exchange resins which bind to and filter out the mineral salts from water.
Because the majority of water impurities are dissolved salts, deionization produces a high purity water that is generally similar to distilled water,
and the process is quick, and without scale buildup.
Deionization does not significantly remove uncharged organic molecules, viruses or bacteria, except by incidental trapping in the resin.
Specially made strong base anion resins can remove Gram-negative bacteria.
Deionization can be done continuously, and inexpensively using electro-deionization.
Deionization does not remove the hydroxide OH- or hydronium H+ ions from water.
These are the products of the self-ionization of water to equilibrium and therefore are impossible to remove.

Start with a pot with a standard steamer insert:

Fill the pot with water, to a level just below the bottom of the steamer insert, when inserted.

Side view showing pot with steamer insert placed on top

Place a bowl in the bottom center of the steamer insert:

Allow room around the sides for the steam to rise around the bowl.

Bring the pot to a boil, and wait until you have a good boil going, and you are producing steam.

This will insure that anything that boils below the boiling point of water is boiled off first.

 

Place the lid on top of the steamer insert inverted / upside down, so that it creates

a low spot in the center where condensation will accumulate and drip from, into the bowl.

Place Ice on top of the lid, to cool the lid promoting condensation.

Scoop water out of the lid with an appropriate sized spoon, and replace melted ice as necessary.

Some water is OK, but you do not want it to overflow. I keep it about 1/2 to 2/3 of the lid volume.

Draw water from the outside edge with the spoon, where water is the hottest, not the cold water from the center, around the ice.

After about 4 trays of Ice (a little over an hour later) you should have about 12 ounces of distilled water in the bowl.

Here is what it looks like:

This will be absolutely PURE Water, with nothing in it but WATER!!!

Allow everything to cool, as everything WILL BE HOT!!!

Once everything is cool, carefully slide the bowl to one side,

so that you can get your fingers in to grip one side of the bowl.

Carefully lift the bowl out. Try not to spill the distilled water.

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