1, Ukulungiselela kwangaphambili ukuqalisa 1). Ngokuhambelana nempompo yokuthambisa igrisi, akukho mfuneko yokongeza igrisi ngaphambi kokuqala; 2). Phambi kokuba uqalise, vula ngokupheleleyo ivalve yokungena yempompo, vula ivalve yokuphuma, kwaye impompo kunye nombhobho wokungena wamanzi kufuneka uzaliswe ngolwelo, emva koko uvale umbhobho wokuphuma...
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