I am thinking of fitting a hard water mains supply to a drinking tap over a= sink in the kitchen. We have a water softener and the hard water tap is cu= rrently in the utility room. We are having the ceiling redone, so would hav= e access into the void. Are there any regulations preventing a 10mm mains w= ater plastic pipe being fed through drilled holes in the joists to terminat= e on a triple tap that has soft hot and cold for normal use and filtered ha= rd water for drinking.
Thanks
John