Hi, I have normal water pressure in my front garden, kitchen, and utility room. My bathroom and rear garden have very poor cold water pressure. For example, if I have water running in the rear garden, the toilet won’t fill and the shower will not work. Please help!
Sounds like mineral deposits on the internal wall of your piping Or undersized piping which will not give you the right volume needed to use several out lets at the same time.
Check your piping with a magnet if it sticks you have Galvanized piping and chances are they are blocked up inside with corrosion.