For hygiene and health reasons, lawmakers around the world have tightened
the limits for what substances drinking water may contain, as recommended
by the World Health Organisation. In Switzerland, for example,
products that are used in drinking water applications must comply with the
requirements of the Foodstuffs Act (Lebensmittelgesetz). The state of repair
and technical condition of all plant and components used in drinking water
supply must meet high quality standards. Based on the stipulations in the
(private-law) regulations of SVGW and DVGW (the Swiss and German gas
and water industry associations), all fittings, devices, components and installation
materials used in the distribution of water must be certified accordingly
or confirmed by SVGW or DVGW to be suitable for the proposed use.
A new SVGW/DVGW standard, KTW W270, governs the use of materials in
contact with drinking water, specifying how they are to be evaluated from
hygiene, microbiological and chemical perspectives.
All materials used in the Progress® aqua series have been certified in accordance
with KTW W270, and thus comply also with national requirements
such as the German drinking water regulations (Trinkwasserverordnung).