When the AquaGen® premium.top recombination system is used, the hydrogen and oxygen gases which evolve during water decomposition are fed into the AquaGen® recombination plugs. By means of an integral catalyst, these gases are recombined in the form of water vapour. This water vapour condenses on the sides of the AquaGen® premium.top vent plugs. The resultant drops of water flow downwards and are returned to the battery.