Ukongeza ekwenzeni iziselo namanzi, kufuneka wenze nezikhongozeli zokupakisha.Amanzi, isiselo, kulula ukuthwala kunye nokuhlangabezana neemfuno zokuzaliswa kweyona nto ingcono kakhulu yibhotile ye-PET.Ukongeza ekuboneleleni ngezisombululo zokuzalisa iziselo ezahlukahlukeneyo, sikwabonelela ngoomatshini bokuvelisa iibhotile ze-PET zamanzi, iziselo okanye ubisi, kunye nezisombululo zokupakisha izitya ezikhethekileyo zotywala, ioyile okanye iimveliso ezahlukeneyo zeekhemikhali.