“Filtered water” is any water that is free of manmade contaminants and also retains enough dissolved minerals to transmit an electrical current.

"Free of manmade contaminants" means to be free of industrial chemicals, agricultural chemicals, and other man made causes of assorted diseases. 

Does it make any sense to strive for greater health by using a source water that is contaminated with disease causing chemicals?  

Therefore, any water that is from an artesian well, a deep spring, or well water that is not in an agricultural area which uses herbicides, pesticides, and synthetic fertilizers, will work well.  City water that is not chlorinated may work, if it is also filtered to removed pharmaceuticals and other chemicals that are flushed down the toilet (few cities do this).  If the above are not viable, then you will have to filter your tap water.

The best option for filtering home water is an eSpring water purifier. (6 minute video explaining the eSpring) The eSpring purifier removes industrial chemicals (including chlorinine) while allowing naturally occurring minerals to pass through, and uses ultraviolet light to kill any biological agent including viruses, bacteria, and fungi.  The UV light is powered by a Tesla non-wired process so the electricity which powers the UV light cannot shock you. 

The eSpring carbon block filter does not have the UV light.  If your water is used for cooking (which kills living organisms in the water) and you are using a RedOx machine for your drinking water, then you probably don't need the UV light.  The difference in cost will more than pay for your RedOx machine.

The replaceable components of both eSprings process water are rated for one year or 1,400 gallons of water (4 gallons every day).  To order one for your home, go to www.amwayglobal.com/tomv and put the word "espring" in the search field.  For a comparison with other filters look at this brochure from eSpring.  

The PureCool filter is a pour through filter with both activated charcoal and crushed ceramic filters.  This filter removes many industrial and agricultural chemicals, from 150 gallons of water with chlorine (only 40 gallons if the water has chlorinine added).   Check out the PureCool at The Water Crock Shop.

An even lower quality option would be any of the “pour through filters” (i.e. Brita) which can be purchased in Big Box stores like Walmart or Target.  The limitation on these types of filters is the low volume, they only remove mud and chlorine but not chlorinine, and they lack any anti-biological capacity.  A typical Brita filter is only good for 40 gallons of water. Considering the amount of water you will be brewing daily (2 gallons of filtered water yields 1 gallon of alkaline drinking water), you could be buying a new filter every twenty days or sooner.   

The second half of the definition of “filtered water” describes the proportion of total dissolved solids in the water (mineral content).  

To allow electrolysis, water should have at least 100 ppm (parts per million) of dissolved minerals.  My water at home varies from 450 to 550 ppm. Neither distilled or RO water will work in an electrolysis machine as each is below 30 ppm.

I had an unexpected illustration of the mineral content of water when my family went to Yosemite for a weekend.  I took one of my ReDoxwater machines but did not take any measuring instruments.  I assumed the water in Yosemite would come from a point upstream on the Merced River that would be free of manmade contaminants and would also be high in dissolved minerals due to the surrounding granite cliffs.  When I got there I began brewing some water.  After one hour, I could see no bubbles and taste no change.  After three hours, I could see no bubbles and taste no change.  After six hours, I could see no bubbles and taste no change.  After twelve hours, I could see a few bubbles and thought I could taste a slight change.  When I brought a sample of the water back to San Jose and tested it, I discovered the Total Dissolved Solids were 40 ppm.  The water was nearly as pure as distilled water or reverse osmosis water.

Note: If I had known how pure the water was, I could have dissolved sea salt in a small glass and added a teaspoon full of the saline solution to each tank, which would have increased the total dissolved solids to allow electrolysis (sea salt contains a spectrum of minerals not just the sodium chloride of table salt) .  Unfortunately, I did not have any sea salt with me.  

(Caveat: if you add sea salt to normally mineralized water, you may cause small electrical arcs which pit the electrodes and may even burn holes in the electrodes.  The electrodes will still work, but the edges will look like saw teeth.  If you use sea salt, use it sparingly.)

How do you know if the mineral content of the water is adequate without a Total Dissolved Soids meter? 

You look at the bubbles on the electrodes and taste the water.

If you have adequate dissolved minerals in your water, after one hour when you look at the electrodes in the water you should see little bubbles, like a fine coating of fur, clinging to the electrodes.  By tapping gently on the electrode in the acid tank, you will see a cascade of minuscule bubbles float up to the surface.  

However, when the electrodes are totally covered with bubbles, or the water smells like heavily chlorinated swimming pool water, or the water stings the back of your throat, the water is too strong to drink.  With the pronounced smell of chlorine, or stinging in your throat, pour out the water and start a new batch for a shorter period of time.
How long does electrolysis take?  That depends on the size of the electrodes, the voltage (not amperage), the volume of water, the amount of dissolved minerals in the water, and the duration (time).  Since the size of the electrodes is fixed, the voltage is fixed, and the amount of water is fixed, then the only variable is the amount of dissolved minerals and the duration (time).

With 150 ppm of dissolved solids, "mild" alkaline water will take about two hours.  With about 300 ppm of dissolved minerals, "mild" water will take about one hour.  With 450 ppm of dissolved minerals, "mild" water will take about 2 hours.  With 550 ppm, mild water could take as long a six hours.  As you can see, a moderate amount of mineral content works best.  However, I prefer the harder water (400 ppm), even though it has to brew longer, because I have this cockamamie idea that our bodies can actually use the minerals that are dissolved in water.

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