Kwizityalo zamandla, ukunciphisa ubushushu be-flue ngokwesiqhelo kuya kubangela ukuba i-flue igqweswe yi-asidi. Iingozi eziqhelekileyo ziquka ukuvaleka kothuli, umhlwa, kunye nokuvuza komoya. Umzekelo: Izifudumezi zomoya, ngenxa yokuba iqondo lobushushu eludongeni lingaphantsi kwendawo yombethe eneasidi, bangela i-corrosi enkulu...
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