Treatment of natural waters
The regulatory requirements for water quality used for drinking and household purposes are regulated by Bulgarian and European legislation:
Examples of choice of purification scheme, depending on flowrate:
Pressurized sand filtration in small treatment plants for individual residential buildings and complexes, for small settlements.
Non-pressure filtration through a granular bed at large purification stations.
Depending on the quality of the water and its variation over the seasons, purification can only be reduced to decontamination of water using disinfectants or other appropriate methods.