The conductivity of water is a measure of the concentration of dissolved salts in water.

Total Dissolved Solids (TDS) is a measure of the combined content of all inorganic and organic substances found in solution in water. Low conductivity water is water that contains from 1 to 100 mg / l total dissolved solids (TDS). This content is characteristic of the quality of the water obtained by distillation, reverse osmosis and deionization.

Globally, there are no organizations with scientific data to support the claim that drinking water with low total dissolved solids (TDS) will have adverse health effects. There is a recommendation for high total dissolved solids (TDS), which is to drink water containing less than 500mg / l.

Information on body homeostasis mechanisms, water supply with natural total dissolved solids (TDS) less than 50 mg / l in communities, historical use of distilled water with less than 3 mg / l TDS on naval vessels, the answer The United States Environmental Protection Agency (US EPA) in this regard, as well as other evidence, demonstrate that drinking water with low levels of minerals is safe.

During the review of drinking water standards by the United States, Canada, the World Health Organization (WHO) and the European Community (EC), no thresholds or optimal levels of total dissolved solids were established. USA . recommended a maximum level of 500 mg / l, as did Canada. In the EU, since the adoption of the new revised Drinking Water Directive (98/83 / EC) in 2003, total dissolved solids (TDS), hardness and alkalinity no longer have recorded limits.

The physical control of the concentration of minerals in the human body.

To better understand the effect of low solids (TDS) water on the human body requires a basic understanding of the body's mechanism. The following is a description of the relevant mechanism (Guyton 2006):

Homeostasis is the maintenance of static or stable conditions in the internal environment of the body. This natural method controls the concentrations of minerals (ions) and water in body fluids within narrow limits inside and outside all cells in all organs and tissues of the body. The kidneys are the most important for maintaining constant ion concentrations (including sodium, potassium, calcium, etc.) through elimination and reabsorption.

Any changes in the normal ion concentration in the cell membrane are corrected in a minute or less, because water moves rapidly through cell membranes. Thus, small changes in osmolality from drinking clean water (0-100 mg / l TDS) quickly reach equilibrium.

The kidneys control the total concentration of body fluid components. They filter about 180 liters of water per day, but over 99% is reabsorbed and only 1.0-1.5 liters are eliminated as urine. If the osmolality of the fluid to be filtered by the kidney is lower than normal (low soluble concentration - such as low TDS water), neural and hormonal feedback mechanisms cause the kidney to excrete more water than normal and thus maintaining the ion concentration in the fluid body at normal values. The opposite is true if the ion concentration of the liquid to be filtered is higher than normal. This homeostatic mechanism of the kidneys maintains the normal osmolality of body fluid.

Due to these kidney control mechanisms, consuming one liter of water could cause an increase in urine output of about nine times after about 45 minutes (due to water absorption in the intestine) and continue for about two hours. Thus, the concentrations of solutes in the blood and other body fluids are quickly maintained by the kidneys through homeostasis. These control mechanisms maintain the sodium concentration at ± 7%.

Therefore, it is obvious that consuming water with low TDS by a healthy person alone can not have unhealthy effects. A "healthy person" is considered to be free from diseases, hormonal problems, etc. and not necessarily a person who eats a healthy diet. Homeostasis is maintained with proper nutrition, as well as other body functions. If homeostasis is not maintained due to significant nutritional deficiencies, diseases or hormonal dysfunction, drinking water with low TDS would be a small (to no) factor in any symptoms that may be observed. It is obvious that illness, physiological dysfunction or significant nutritional deficiencies can cause a "flush" problem, but not because of the daily consumption of one to two liters of water with low TDS.