- Isolate water cylinder from the mains water supply
- Drain cylinder
- Add chemicals agents
- Fill water supply back to full capacity of the tank
- Disconnect tank and fully flush out to a suitable drain point
- Flush the system with clean water .
- ensure removal of any remaining disinfectant
- Re-connect cylinder to correct flow rate
- Check for leaks and issues with tank
- Provide a written record tank, products used, test results ,corrective
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