Izindwangu ezingangeni manzi ziyizindwangu, ngokwemvelo, noma eziye zaphathwa ukuze zibe, zimelana nokungena kwamanzi nokumanziswa.
Sinezindlela ezimbili zokufeza indwangu engangeni manzi.
Enye indwangu engangeni manzi ngendwangu elaminethiwe, enye iyindwangu eboshwe, efana ne-PU ne-PVC, i-PE njll.