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-Inspection and assessment of site.
-Multi-step scientific way of cleaning & disinfecting Water storage tanks.
-Recognition and approval from Govt. bodies Private corporate
-Water tank cleaning of any capacities

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Step 1:Cleaning the tank:

The tank must be cleaned to ensure that water stored in the tank does not become contaminated by dirt or traces of the substance the tank previously held. This can be achieved by following the three steps below:

1. Drain/empty the tank.

Open the outlet valve/tap and drain out any remaining liquid. Collect the Liquids so that they can be safely disposed of. Most tankers have their outlet valve at the back, so park it on a slope so that all the liquids can be discharged. Permanent storage tanks are usually fitted with a Washout valve that draws water from the base. Use this for emptying rather than the normal outlet valve. The process of emptying the remaining liquids from portable tanks will depend on the shape and design of the tank. Some can be tipped on their side and others dismantled.

2. Clean/scrub all internal surfaces:

Use an Anti¬-bacterial agents and water to clean all internal surfaces of the tank. This can be done with a stiff brush or a high pressure jet. If the tank has contained volatile substances such as oil or organic liquids such as milk, try not to enter the tank as the gases given off by the liquids could be dangerous. Attaching the brush to a long pole may make it possible to clean the tank without entering it.

3. Wash all internal surfaces.

This is most easily done with a high-pressure hose pipe or water jet. Drain all the water from the tank and collect for safe disposal as before. Continue flushing the tank until there are no longer traces of Antibacterial agent in the water.

Step 2: Disinfecting the tank

1. To effectively disinfect the tank, fill it with clean water up to ¼ level only. It is important to not fill the
tank too much as this will reduce the concentration of the chlorine solution and limit the effectiveness of
Cleaning. To estimate ¼ of the tank, use a stick with graded markers to indicate the water level. The
markers should be marked on to the stick at 10cm intervals beginning at 0cm at the base of the tank and then upwards to 10, 20cm etc.
2. Prepare a concentrated chlorine solution to disinfect the tank. The best source of chlorine to use is High Test Hypochlorite (HTH) granules or powder as this normally contains 50 to 70% chlorine.
3. Pour the solution slowly into the tank, mixing as you pour and then fill the tank up to full capacity with Clean water.
4. Let the chlorine stand in the tank for 24 hours to ensure that the tank is fully disinfected. If the tank has a cover (which is recommended) it should be closed.
5. If the tank is required for use urgently double the quantity of chlorine added to the tank. This will reduce the standing time from 24 to 8 hours.
6. Completely empty the tank and carefully dispose of the disinfecting water as it will contain a high Concentration of chlorine.
7. Remember to also clean and disinfect any pipes or hoses connected to the tank.

Health and safety issues
Gaining access and working inside a water tanker can be difficult and dangerous. Frequently there is only a small access hatch on the top of the tanker through which to get in and out. Cleaners should be aware that some liquid carried in tankers can give off dangerous gases which may remain even when the liquid has been removed. The liquids may also cause physical dangers such as falling on slippery surfaces. Always blow fresh air into the tank for a period before allowing a person to enter the tanker. The cleaner should wear protective clothing, including gloves, boots, a hat and glasses. Make sure someone remains outside, next to the access hatch all the time someone is working inside in case there is an accident.