Nedre Romerike Vannverk (NRV) IKS and Nedre Romerike Avløpsselskap (NRA) IKS invites tenderers to an open competition for a framework agreement for precipitant chemicals, of the type Polyaluminiumchloride (PAC) for a 2 year period. The framework agreement can be extended for a further 2 years, 1 year at a time (2 + 1 + 1 years).