New bathroom was installed in early April 2022, by a small company
Traces of Grit / Dark particles in water from mixer tap -bathroom basin only - occur when tap is full blast pressure. Noticed this contamination in summer 2022.
My Microscope shows dried out particles look similar to dirt-sand
Water authority have ascertained that the water contamination is due to internal pipes, not their supply from the street.
Maybe it’s due to the tap? Maybe the copper pipes?
I’m just guessing.
NB
house has a Combi boiler