Object: Electronic Auction - Supply In Installments Of 100,000 Kg (One Hundred Thousand Kilograms) Of Water-Based Defoamer And 100,000 Kg (One Hundred Thousand Kilograms) Of Silicone-Based Defoamer As Well As The Supply Of The Equipment And Materials Necessary For Its Dosage At Samae'S Sewage Treatment Stations (Ete), According To The Term Of Reference Annex I, Of The Notice.