A float glass apparatus typically includes a float tank for a metal bath, the metal bath, a glass melt producing unit, which includes a melting tank for making a glass melt and a refining, tank for degassing the glass melt, and conducting devices for conducting the glass melt from the glass melt producing unit to the metal bath of the float tank and auxiliary devices as needed. In order to minimize bubble defects and extend service life of Pt units by a suitable electrical device the float tank with the metal bath is connected electrically with ground and at least one auxiliary electrode is connected with ground and put in electrical contact with the glass melt in the melting tank.