1) Indawo yokugcina insimbi noma indawo yokugcina impahla, kufanele ikhethwe endaweni ehlanzekile, eshelelayo yokukhipha amanzi, kude namagesi ayingozi noma izimboni zothuli nezimayini. Ukuba khona phansi ukuze kususwe lonke ukhula nemfucumfucu, kugcinwe insimbi ehlanzekile; 2) Esitolo esingenawo i-asidi, i-alkali, usawoti, usimende, insimbi nokunye...
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