something is not grounded, more then likely a handrail or ladder is the culprit, if your handy take a digital volt meter and put black probe in the pool water and red one on the metail rail and you will see a low reading probaly around 10volts. to fix this dig up handrail and throw it away or ground it.
i would reccomend a electrician
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If the wire is carrying an electrical current, and if the current has enough voltage, the current can leave the wire and pass through your body. This is painful, and can causes burns or death.
Difficulty breathing
The severity of an electrical shock is dependent upon three things. Location or the proximity to the source. The second is amperage, the duration of the exposure and the pathway in the body. The third is the distance of the source.
A shunt resistor is used to carry a majority of the electrical current away from the outlet. This causes the risks of electric shock to be down significantly, but still not completely gone.
The electrical cleaning equipment should be grounded. This grounding is what protects the operator from a serious shock should the the cleaning equipment have an electrical fault occur.