Water concessionaire Maynilad revealed on Friday that it has already resolved water discoloration that affected thousands of its customers on 9 November.
Maynilad Water Supply Operations head Engr. Ronald Padua explained that the water discoloration was reaction of higher level of manganese with the chlorine they use to disinfect water.
He added that it only lasted for a few hours and they have already resolved it in their chemical treatment plants as he stressed that the yellowish water is not dangerous.
Maynilad said this was expected, after shifting to a low level outlet due to the rehabilitation of the Angat Hydro Electric Power Plant.
They encouraged consumers to flush the water out.
Padua said Maynilad is not expecting a repetition of the incident, as there are many ways to address the issue.
Meanwhile, the Metropolitan Waterworks and Sewerage System said it is investigating the incident.