Cishe eminyakeni eyizi-6 000 edlule, amaSumer athola isiphuzo esinenjabulo esaduma emhlabeni wonke: ubhiya.Ukuze kugcinwe ukuvumelana kokunambitheka, ubusha kanye nekhwalithi kabhiya, inqubo yokuhlunga ulwelwesi ngesikhathi sokuphisa idinga ukulawula ngokuqinile ama-microorganisms, izinto eziphilayo, ukucaciswa, kanye nokunambitha okungcono.I-Dongguan Qinda ineminyaka engu-18 yentuthuko kanye nesipiliyoni sokukhiqiza, kuhlangene nelabhorethri ingahlinzeka ngezinsizakalo ze-microbial kanye nokuqinisekisa, ukuqinisekisa ukuzinza nokusebenza kahle kwemikhiqizo enikeziwe.
