The reservoir inside a dispenser builds up scale and bacteria easily if it goes a long time without cleaning.

Plenty of households and offices are careful about which jug water they buy, and then forget about the dispenser — the place where the water sits before it reaches the glass.
What happens inside a dispenser?
Over time the reservoir, the pipework and the taps can collect scale, mould or bacteria, particularly on the cold side and when the unit stands somewhere damp or in the sun.
Signs it needs cleaning
- The water has an unusual smell or taste.
- You can see scale or green marks on the tap or drip tray.
- It has been a long time since the dispenser was last cleaned.
See the process on the Happy Sip Dispenser cleaning page.