Izikhala eziningi ezivikelwe ezivikelayo ezimisele ekuphendulweni kwamanzi (isibuko somoya) kuyavikelwa ekupayini kwamanzi, okunamathisela ukuvikelwa okunempilo, nokwenza kube nomsebenzi onzima. Kuyakhiwa ukusebenza ekuphendulweni kwamanzi kwezinkanyezi zomlilo kanye nezinye izinto. Isitshalo sinezimo ephothulwe, isilinganiselwe, kanye nokukhanya; Ngokwezimo yezindawo zokulawula, izinkanyezi zezikhala eziningi ezivikelwe kwiakhiwo kanye nezinye izinto, kwenza ukusebenza kube ngcono. Izinkanyezi zomoya ziyakha ngezindlela ezithile, zikwazi ukwenza ukuphendulwa okuncane; Isigodi siyakha ngezindlela ezinhlanu ukuze kwenzeke ukuthi isha ayisakwazi ukwenzeka ngokwezimo zomoya, futhi ayikwazi ukukhunjulwa, kwenza ukwakhiwa kwesikhala kube kuhamba kahle, kwenza kube kuhamba kahle ukuphila kweproduct.