WHY DO YOU EXCHANGE A GAS CYLINDER INSTEAD OF REFILLING IT?
Because Refilling a Gas Cylinder at Home is Dangerous.
WHY DO YOU REFILL YOUR CARTRIDGE INSTEAD OF EXCHANGING IT?
While Refilling The Cartridge at your Work Place, The Colorless & Odourless microscopic toner is spread in the Air and they settle in your Office. These toner particles are Invisible to naked eyes & they are extremely harmful when inhaled over a long period of time.