I-Polymer concrete sump yimithombo embozwa ngamabhulokhi ngezikhathi ezithile lapho ingcwaba amapayipi angaphansi komhlaba noma ngokuphenduka. Ilungele ukuhlolwa okujwayelekile kwamapayipi kanye nokudonsa. Iqoqo lekhonkrithi le-resin liyingxenye ebalulekile yohlelo lokudonsa amanzi. Ayenzi nje kuphela ukuchithwa kwesistimu ye-drainage, iqoqa imfucuza, futhi ivikele ukusebenza okuvamile kwesistimu yokudonsa amanzi, kodwa futhi ingasetshenziswa njengomthombo wokuhlola ukudlala indima ebalulekile ekugcinweni kwesistimu yokudonsa amanzi. Iqoqo lamanzi eliqediwe kahle linezici zobukhulu obunembile, isisindo esincane namandla aphezulu, okunciphisa kakhulu isikhathi sokufaka futhi kuyingxenye ebalulekile yesistimu yokukhipha amanzi ekwakhiweni kwephrojekthi.