Water extinguishers are used on solids such as wood, paper, fabrics and other A class fire risks. The water cools the fire and extinguishes it. It penetrates into burning fabrics and can extinguish pockets of fire even deep in the core of the fire. Refilling water extinguishers is cheap and uncomplicated. The fire fighting capacity of water is of course limited so that large water fire extinguishers are required to fight even small fires. If water extinguisher are to be used near electrical equipment we would recommend choosing water extinguishers with additives that stop the current flowing through the extinguisher spray and the resulting puddles.