Madzi oyeretsedwa amatanthauza H2O opanda zonyansa, omwe ndi madzi oyera kapena madzi oyera mwachidule. Ndi madzi oyera ndi oyera opanda zonyansa kapena mabakiteriya. Amapangidwa ndi madzi omwe amakwaniritsa miyezo yaukhondo yamadzi akumwa a m'nyumba pogwiritsa ntchito njira yaiwisi ya electrodialyzer, njira yosinthira ion, reverse osmosis njira, distillation, ndi njira zina zoyenera kukonza. Mukhoza kumwa mwachindunji.
M'zaka zaposachedwa, ndikusintha mosalekeza kwa chikhalidwe cha anthu, kuchuluka kwa moyo, komanso kuchuluka kwa momwe amadyera, anthu asintha kuchoka pa zofunika pamoyo monga chakudya ndi zovala ndikuyamba kufunafuna zinthu zachilengedwe komanso zathanzi komanso moyo. Kwa madzi akumwa ofunikira m'miyoyo ya anthu, machitidwe ake ndiwodziwikiratu. Pakalipano, gawo la msika la madzi akumwa m'makampani azakudya ndi zakumwa lafika 40%. Pakati pawo, madzi oyeretsedwa amakhala oposa 1/3. Choncho, njira yonse yopangira madzi oyera iyenera kuyang'aniridwa ndi kuyang'aniridwa mu nthawi yeniyeni kuti zitsimikizire kuti madzi oyera omwe amaikidwa pamsika ndi zinthu zoyera, zoyera komanso zoyenerera zomwe zimagwirizana ndi malamulo ndi malamulo oyenerera.
Chifukwa cha kuchepa kwa madzi oyera, ma electromagnetic flowmeters wamba sangathe kuyeza.
Kuphatikiza pa ma electromagnetic flowmeters omwe amagwiritsidwa ntchito kwambiri, Sinomeasure imatha kupereka ma turbine okwera okwera kapena ma ultrasonic flowmeters popanda kusweka kwa chitoliro malinga ndi zosowa zamakasitomala zoyezera madzi oyera.