Water Coolers Direct asked:
It is important to note that the following sanitisation process should be carried our every 3 months or sooner if there has been any known contamination of your water cooler or water machine. If your machine or cooler is left unused or left empty for a length of time then you should also sanitise the machine immediately before letting people dispense water from the machine.
If your water cooler is connected to the mains water supply then you must replace your filter every 6 months. If your filter is older than 6 months then it must be REMOVED from the machine to avoid Health and Safety concerns.