Kalma na gabaɗaya don hanyoyin allura waɗanda ke amfani da hanyoyin sinadarai na musamman don haɓaka dawo da mai, cire lalacewar samuwar, tsaftataccen toshewar huɗa ko samuwar yadudduka, rage ko hana lalata, haɓaka ɗanyen mai, ko magance matsalolin tabbatar da kwararar ɗanyen mai.Ana iya yin allura akai-akai, a batches, a rijiyoyin allura, ko kuma a wasu lokuta a rijiyoyin samarwa.