Kukho izithako ezine eziphambili kulo naliphi na utywala: iinkozo ezibolile, igwele, amanzi, kunye neehops.Ezi zithako ziya kuqinisekisa ubunjani botywala, ubunzulu bencasa, kunye nevumba elimnandi.Iinkozo ezibolileyo zibonelela ngomqolo oneswekile etyiwa yigwele ukuvelisa utywala kunye nekharbon diokside, ngelixa ihops len...
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