Here and in the related pages you'll find all the answers to these questions. Indoor plumbing became available to the developed world in the late 19th century and common in the mid- 20th century although it is still not found in many poor areas and countries. The composition of natural mineral waters was also compared with those of the respective tap waters, using surface water at source as raw material. Manganese (Mn) Food usually covers the recommended daily intake of 2-3 mg. An excessive concentration in water is not necessarily harmful, but originates the same problems as iron (unpleasant taste and colour). Arsenic (As) Arsenic can be toxic even in low amounts. The risk occurs particularly in showers or Jacuzzis. Aluminium can have toxic effects even in small quantities. The daily sodium chlorine intake is 20 mg. Due to our diet very rich in salt it is recommended to drink water with a sodic content lower than 20 mg/l, particularly for ipertense people and children. Cadmium (Cd) Cadmium is a highly toxic heavy metal, considered carcinogen. Among the several brand on sale, which one should we choose?  Permitted is the removal of iron, manganese, sulfur and arsenic through decantation, filtration or treatment with ozone-enriched air, in so far as this treatment does not alter the composition of the water as regards to the essential constituents which give it its properties. Bacteria are carefully monitored in public water supplies, since they can be responsible of serious diseases as typhoid, cholera, hepatitis etc. Tap water, which may be hard or soft, is delivered via a complex system of pipes, pumps and purification systems to homes and buildings through individual taps. In contrast to these well-known mineral water brands, Thank You Silver has a mineral content of only 10 ppm. Minerals can enter surface or ground water through natural sources, industrial sewage, leach age from urban or agricultural areas, water pipes walls or even from domestic sources. The World Health Organisation recommend a minimum calcium daily intake of about 700 mg. We can contribute to the reduction of this pollution source, using only the minimum necessary quantity or choosing biodegradable surfactants. The salt consumption in industrialized countries is considered much higher than the recommended levels (about 3.9 g/day on average). The recommended daily intake by EEC is 40 picog. Selenium is useful to attack free radicals and then prevent aging. Sodium, potassium, calcium, Drinking calcium poor water is considered dangerous for the risk of coronary diseases. Fluorine (F) In someone opinion fluorine is useful for the good health of bones and teeth, sometimes it is even essential, in others opinion it is unnecessary when you are adult, above all if it is added. Il Punto d'incorntro, 2003, Health risks from drinking demineralised water, Distributieweg 3 2645 EG Delfgauw The Netherlands Phone: +31 152 610 900 fax: +31 152 616 289 e-mail: email@example.com, 5975 Sunset Drive South Miami, FL 33143 USA Phone: +1 877 453 8095 e-mail: firstname.lastname@example.org, Level 5 - OFFICE #8-One JLT Tower Jumeirah Lake Towers Dubai - U.A.E. Lead (Pb) Lead is poisoning even in small amounts for microorganisms, interfering with haemoglobin formation and with the functionality of central nervous system. Most viruses are killed by chlorination, and anyway most of the viruses carried by water are too week to be harmful for humans. However mercury is not commonly found as pollutant in our drinking water. If this water lingers for long time in the pipes it can adsorb lead. Water we drink water or it is far more common for mineral water commercially available worldwide neurological behavioural! 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