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For testing for the presence of water at the bottom of fuel storage tanks
Applied to a rod / length of string with bottom weight, the brown paste changes colour to brilliant red where it comes into contact with water, giving you a visual indication as to the depth of the water present.
If you have a significant amount of water in your tank it should be pumped out and the test repeated until there is insufficient water to pump, at which point one of our Tank Sponges can be used to absorb the last of the water.
Suitable only for use with Petrol, Diesel, Kerosene, Gas Oil, Heating Oil, Heavy Oil, and Lubricating Oil.