- All Cold Water Tanks should be emptied, scrubbed, and their walls whitewashed with chlorinated water.
- All Hot Water Tanks (boilers) should have their interiors (inner surfaces) cleaned (removal of lime scale and sediment).
- All Filters connected to the water system should be removed for detailed cleaning and disinfection.
- All Shower Heads, shower hoses, faucet aerators, and garden irrigation sprinklers should be removed for detailed cleaning and disinfection.
- All Cooling Towers should undergo detailed cleaning and disinfection.
- All pool Balance Tanks and Filter Sands should be thoroughly cleaned and disinfected.
- Perform Chlorine Shock Treatment by adding chlorine to cold water tanks. The target free chlorine concentration is 3 ppm, with a 24-hour retention time within the system.
- Increase the water temperature inside boilers to 70 ºC and run hot water from all showers and faucets (bath, hairdresser, etc.) at a pencil-thickness flow for 5 minutes each. Perform Thermal Shock Treatment.
- Raise the water temperature inside boilers to 70 ºC and measure and record the temperature at the bottom drain valve.
Record Keeping
Write down all performed procedures on appropriate forms or prepare minutes and sign them.
Important
To reduce the risk of Legionnaires' disease, be sure to perform the above-mentioned procedures before the season starts.
Number: 40 • March 18, 2014
Note: The required actions may be more than those mentioned above. The important ones are included in this reminder, and the order of importance may vary depending on the risk situation.