How to Sterilise Your Water Supply Tanks

The Timaru District Council recommends that all tanks are sterilized annually (If the tank has no accumulated material in it steps 2-4 may be omitted).

1.Turn off the water supply into the tank.

2. Drain the tank completely.

3. Clean out the inside of the tank of all accumulated matter.

4. Liberally spray 'Janola' or a similar chlorine based product over the internal floor and walls of the tank.

5. Refill the tank adding .3 litres of 'Janola' per 1000 litres (220 imperial gallons) of tank volume. Allow this water to stand in the tank for at least 30 minutes.

6. Drain the tank completely and flush with clean water.

7. Refill the tank with fresh water.

The use of 'Janola' will ensure that the tank is adequately sterilised and suitable for holding drinking water. It is important that the tank is completely drained at step 6 as the strong 'Janola' concentration will make the water extremely unpleasant to drink.

Should you be on a Restrictor System you need to be aware that the filling time for your tank will be extended.

For assistance calculating the volume of the tank please measure the diameter and water depth of the tank then please contact us.