Asal-ka-dhac Haddii ay tahay khadka jirridda ama shabakad aagga magaalo-madaxda ah, Ilaha godka dhuumaha dhulka hoostiisa ayaa aad u adag. Marka la barbardhigo fiilooyinka caadiga ah, Isticmaalka xadhkaha-yar ee hawada lagu afuufay waxay badbaadin kartaa ku dhawaad 50% khayraadka ku jira godadka dhuumaha. Qaab dhismeedka caadiga ah ee nidaamka fiilada-yar ee hawo-u-qarxiyay waa hooyada tuubo-beeb-yar-yar. Tuubada hooyada waxaa lagu dhejin karaa godka tuubada shubka ah, waxaana sidoo kale la samayn karaa dhismo cusub oo marin ah. Tuubada waalidka ee HDPE ama PVC ee hore loo dhigay, ama horay u jiifi tubbada waalidka iyo tuubada yar-yar ee marinka fiilada indhaha ee dhawaan la dhisay, waa la afuufi karaa tuubada ama waa la afuufi karaa..