Rainwater Storage Tank Cleaning Systems

Most rain water tanks will from time to time build up silt and bacteria. To ensure this does not harm your family we suggest you clean the tank periodically as per the attached abbreviated supplement from Ministry of Health.

1. Add chlorine to tank through tank lid. The average size tank is 20,000 litres, therefore from table (page 5) you should add 3,300mls (3.3 litres) of plain household bleach for 25,000 litre tanks use 4,175mls (4.175 litres)
2. To mix this up, place a garden hose that is after house pump back into tank through lid. Leave this hose running for 4 hours to mix water and chlorine together. After 4 hours remove hose and turn off.
3. Then open each tap in the house until chlorine smell (like swimming pool) can be smelt at each tap. Note: it will take 15 minutes to turn over the average 180 litre hot water tank. Note: Include every tap dishwasher, washing machine, outside hoses and toilets.
4. Leave taps shut for at least 40 minutes. This will give chlorine time to kill any bugs.
5. Fit filter and UV treatment system AP-MaxA, AP-MaxB, AP-MaxC, or AP-MaxE to pipe work directly after pump.
6. Ensure that the UV is on at all times it must be operating to kill bugs as water will be used even when pump is off.

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