Igwe mmiri ọñụñụ dị n'etiti ọha na eze (ụlọ akwụkwọ. ụlọ ọgwụ, ọdụ ụgbọ mmiri, ụlọ oriri na ọṅụṅụ, ụlọ ahịa ahịa, okporo ụzọ, wdg) bụ ngosipụta nke ọganihu ọha na eze ma na-enyere aka melite ihu ọma ndị na-azụ ahịa.Ọkachasị n'ihe gbasara COVlD-19, akụrụngwa ezughị oke abawanyela mkpa akụrụngwa dị.Dongguan ụdị nwere ihe karịrị 18 afọ ahụmahụ na mmepe ụlọ ọrụ, Kinda na-enye kwụsiri ike na ịrụ ọrụ nke ọma mmiri ọgwụgwọ ngwọta na-aga n'ihu na-emepụta.
The Ministry of Education of the People's Republic of China nyere ụkpụrụ ụlọ ọrụ mmepụta ihe nke chọrọ teknụzụ na nkọwa akụrụngwa maka ọgwụgwọ akpụkpọ anụ akụrụngwa mmiri ọñụñụ na ụlọ akwụkwọ praịmarị na sekọndrị (JY / T 0593-2019), 5.2.1 na Ihe Odide A kwuru na: ( Ụlọ akwụkwọ praịmarị na ụlọ akwụkwọ sekọndrị) kwesịrị ịnakwere ultrafiltration na nanofiltration (naanị n'ebe ndị nwere nnukwu ihe ize ndụ nke mmetọ mmiri mmiri, a pụrụ iji reverse osmosis mee ihe. Mgbe mmiri mmiri dị mma na-ezute ọkọlọtọ, nanofiltration ma ọ bụ ultrafiltration nwere ike iji maka ọgwụgwọ).