Codes of practice for drinking water installations - Part 100: Protection of drinking water, drinking water quality control; DVGW code of practice— 19 стр.
Protection against pollution of potable water installations and general requirements of devices to prevent pollution by backflow; German version EN 1717:2000; Technical rule of the DVGW— 53 стр.
Drinking water supply from small units and non stationary plants - Part 2: Non stationary units - Guidelines for drinking water, planning, construction, operation and maintenance of units— 40 стр.