If you’ve noticed discolouration on your shower head (chalky white, green or brown) and it runs with very little power, then it probably means you’ve got a lot of calcium or limescale build up. While this offers no risk to your health, it does mean that you’re not going to get the greatest performance out of your shower that you could be enjoying. So if this is what is happening to you, here’s what you can do about it without necessarily having to call your local plumber.