Chlorination of Water System on Vacant Building

Chlorination of Water System on Vacant Building


A church hall was vacant for 24 months. The remedial team have gained years of experience in carrying out a full chlorination of the building water systems to ensure safe, clean water and compliant water before re-opening.

The problem:  

The stagnation of water and no regular flushing will result in a perfect breeding ground for bacterial growth such as Legionella within the water system. Because of this, the risk of exposure to Legionella is high. As a result, precautions are required to eliminate or reduce the risk of exposure to visitors and staff.

The solution:

Our fully trained team with years of practical experience and knowledge will carry out the following in line with L8 and ACoP and to a very high standard of work :-

Step 1 – Full clean and chlorination of Cold Water Storage Tank – the team will empty the tank and scape all internal panels and vacuum the floors to remove all the sediment build up. Photos will be taken to show the condition of the tank and report any signs of damage, corrosion, scale or missing rodent screens etc to the client. The tank will be filled, and the water will be chlorinated with Silver Hydrogen Peroxide.

Step 2 – Full chlorination of the Building Water System – Firstly to dose the stored water with Silver Hydrogen peroxide. This is WRAS approved for drinking water and safe. The team will do this for at least 1 hour to ensure all waterborne bacteria is eliminated.  Secondly, they will carry out a system flush and allow the chlorinated water to reach all the water outlets. Thirdly, the team will test all the water outlets and ensure the solution is 50PPM for one hour. The tank will be re-filled, and microbiological samples shall be collected to give peace of mind that the water is safe, clean and compliant. 

Step 3 – Descale and Disinfection – In addition, the team will strip, clean and disinfect all taps to remove the buildup of limescale which acts as a breeding ground for bacterial to flourish.

Step 4 – TMV’s Strip, Clean and Calibrate – it is important to regularly strip, clean and calibrate TMVs. This will ensure they are working as needed and maintaining the correct temperature to prevent scalding. Furthermore, this will ensure there is no build-up of dirt that could lead to the additional growth of Legionella.

Step 5 – Thermal disinfection on POU Water Heaters and Calorifiers – by carrying this out this will improve energy efficiency, kill any legionella and reduce biofilm. This will minimise system failures. 

Techright Environmental Provides:-

  • System Chlorination certificate
  • Water Tank Chlorination certificate
  • Risk Assessment and Method Statement of work
  • Completion report with client signature showing photos of work
  • Microbiological sampling of the water at a UKAS accredited laboratory

The Result:-

Overall, this will improve the water quality and reduce this risk of exposure to bacterial micro-organisms such as Legionella. The water tank cleaning will remove scale, biofilm, stagnation, slime, sludge and algae. The chlorination of the water eradicates the growth of bacteria.  Microbiological samples will give peace of mind that the water is safe, clean and compliant.