What specific fluid checks must be performed on a potable water truck before servicing an aircraft, to prevent contamination?

Before servicing an aircraft with potable water, specific fluid checks must be performed on the potable water truck to prevent contamination. The most crucial check is to verify the chlorine level in the water. Chlorine is a disinfectant that kills bacteria and other harmful microorganisms. The chlorine level should be within the range specified by health regulations, typically between 0.2 and 2.0 parts per million (ppm). A chlorine test kit should be used to measure the chlorine level. A visual inspection of the water tank is also essential. ....