Abstract: A method for controlling the rate of filling bottles as they are moved by a rotary table, in which position indicating devices are attached to the pistons which move the filling nozzles up and down in the vertical direction, the position indicating devices are detected just before the bottles are discharged from the rotary table to determine whether filling of the bottles is completed by means of two piston position detecting devices A and B which devices are circumferentially spaced-apart so as to define an included angle .theta. of 10.degree. to 30.degree. with respect to the center of the rotary table, and the rotation speed of the rotary table is increased or decreased so that the proportion of completely filled bottles detected by the first or leading detecting device A during each rotation of the rotary table is less than 100% but the proportion of completely filled bottles detected by the second or trailing detecting device B during each rotation of the rotary table is 100%.