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What is the best accepted range for TDS for potable water?

Total dissolved solids (TDS) is the term used to describe the inorganic salts and small amounts of organic matter present in solution in water. The principal constituents are usually calcium, magnesium, sodium, and potassium cations and carbonate, hydrogen carbonate, chloride, sulfate, and nitrate anions.

Organoleptic properties

The presence of dissolved solids in water may affect its taste. The palatability of drinking- water has been rated by panels of tasters in relation to its TDS level as follows: excellent, less than 300 mg/litre; good, between 300 and 600 mg/litre; fair, between 600 and 900 mg/litre; poor, between 900 and 1200 mg/litre; and unacceptable, greater than 1200 mg/litre. Water with extremely low concentrations of TDS may also be unacceptable because of its flat, insipid taste.

A high TDS measurement only shows that your water sample contains a high concentration of dissolved solids such as minerals and salts. If you already have a filter in place, the measurement will vary depending on how your filter works and how clean/dirty the filters are.
The TDS measure SHOULD NOT be taken as a measurement of how contaminated or polluted water is. Water coming out of the tap is almost always guaranteed to contain a percentage of dissolved solids. This could have originated at the processing plant in which chemicals are added to clean and treat the water before supplying back to the public. Some minerals are added for the advantage of the consumer such as flouride. Other sources of dissolved minerals could be the actual plumbing itself which might make use of copper or some other metal pipes - corrosion of these pipes result in minute leeching of minerals into the water. A high TDS measurement does not equal contaminated water because the TDS meter does not distinguish between the minerals it measures. The meter is VERY easily swayed by something as simple as addition of a few grains of table salt into the sample or heating/chilling/freezing it.


The proper amount of minerals in water is indeed being regarded and discussed controversially. Depending on who wants to sell what, the recommended TDS-values (measured in µS) differ from "close to zero" to "1000 to 3000 is fine". People and companies selling reverse osmosis or de stilling technology usually belong to the first, organizations delivering tap or mineral water align among the second group. Who to believe? Like always, there is scientific proof for either side. From "only desalinated water can save your life" to "minerals in water are essential and may not be removed" anything can be scientifically proven and be argumented eloquently. But there does definitely not exist any study obeying scientifical standards that could prove a direct relation between TDS-value and any diseases or death rate.

Our Approach

From a non-scientific perspective‚ the simple fact that nowhere on this planet do we find naturally occurring de-mineralized water‚ should tell us that we were not meant to have it. In nature all fresh water contains traces of natural minerals like calcium‚ magnesium and potassium‚ which is what our body was designed to run on and what the Aquatic Smart system produces.

According to the U.S. Environmental Protection Agency, "Purified" water, that is essentially mineral-free (low TDS), is very aggressive, in that it tends to dissolve substances with which it is in contact. Notably, carbon dioxide from the air is rapidly absorbed, making the water acidic and even more aggressive. Many metals are dissolved by low TDS water.

The arguments against drinking dematerialized water are that we lost a primary source of necessary minerals in our diet and that water that has lost its own minerals will attract and absorb minerals in our body, causing a mineral deficit.

Advocates of dematerialized, ‘soft’ water low TDS water from Reverse Osmosis (RO) filters, believe that all the minerals, vitamins, proteins and enzymes we need to survive come from food stuffs, namely fruit and vegetables, in an organic form that the body can absorb and process.

Medical chemist and leading authority on mineral metabolism, Dr John Sorenson  disagrees. He says that, ‘the metabolism of essential versus non-essential metallic elements is greatly affected by the amount of essential elements in the water.  If the needed essential element is present, there will be little or no absorption of the non-essential element and it’ll simply be excreted.’ For example, if high amounts of calcium and magnesium and low levels of lead are in our drinking water, the body will select the essential elements (calcium and magnesium) and excrete the non-essential element (lead), If however, there are low levels of calcium and magnesium, the cells could select the non-essential lead, which would result in a dysfunctional protein or enzyme.

In the draft of the rolling revision of the WHO guidelines for drinking-water quality, titledHealth risks from drinking dematerialized water by F. Kožíšek, the possible health consequences of low mineral content water consumption are divided in the categories: direct effects on the intestinal mucous membrane, practically zero calcium and magnesium intake, low intake of other elements, loss of calcium, magnesium and other essential elements in prepared food, possible increased dietary intake of toxic metals, possible bacterial re-growth.

LOW TDS drinking water is acidic  

One of the primary reasons Reverse Osmosis (RO) water is unhealthy is because removing the minerals makes the water acidic (often well below 7.0 pH). Drinking acidic water will not help maintain a healthy pH balance in the blood, which should be slightly alkaline.

In the natural health and medical communities, acidosis in the body is considered an underlying cause of most degenerative diseases. In fact, in 1931, Dr. Otto Warburg won the Nobel Prize for discovering the cause of cancer. In essence, he said it was caused by a lack of cellular oxygenation due to acidosis in the body.

Medical research has also determined that drinking acidic water (as well as other acidic beverages) will often cause a leaching of essential minerals, such as calcium and magnesium, from the body, especially from the bones and teeth, in order to neutralize the acidity.

Other possible health risk effects of acidic water like small intestine problems, heart problems, kidney and pancreas problems, are being reported.


Reverse Osmosis (RO)

Reverse Osmosis filtration (RO) uses a membrane which removes many contaminants from water. It is usually paired with a Granulated Activated Charcoal filter to remove chlorine and many mount under the sink and have a holding tank. The semi permeable membrane separates many contaminates (which usually have a larger particle size that water) from the water and rejects a large amount of water in the process.

The result is a waste of several gallons of water for every gallon filtered and many naturally occurring minerals (including calcium and magnesium) are also removed from the water. read more...



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