An ƙera mahaɗin ruwa don narke da haɗa nau'ikan ruwa mai ɗanɗano daban-daban da samfuran ƙasa mai ƙarfi a cikin ƙaramar saurin motsawa da babbar hanyar tarwatsewa tare da haɓakawa da faɗuwa.Kayan aiki sun dace da emulsification na magunguna, kayan kwalliya, samfuran sinadarai, musamman kayan da ke da babban danko ko ƙasa mai ƙarfi.
Wasu kayan suna buƙatar dumama zuwa wani zafin jiki (wanda ake kira pretreatment) kafin a haɗa su da wasu kayan. Don haka tukunyar mai da tukunyar ruwa yana buƙatar a lika shi da mahaɗin ruwa a wasu lokuta.
Ana amfani da tukunyar emulsify don kwaikwaya kayan da ake sha daga tukunyar mai da tukunyar ruwa.