A float switch plays a crucial role in ensuring the safe and reliable operation of domestic RO water purifiers. It is designed to monitor the water level in the storage tank, automatically turning the system on or off as needed. When the water level reaches the preset limit, the float switch halts the water flow to prevent overflow, ensuring efficient water use and protecting the RO system from potential damage. By maintaining optimal water levels, the float switch helps enhance the longevity of the system and ensures a continuous supply of purified water without wastage.