Patent ID: 8528593

Claim:
Method for carrying out a bleed and feed of process solutions in a process tank, in which the feed solution is pumped out of a first tank (T 1 ) into a first receiving space (G 1 ) for the feed solution, and the first receiving space (G 1 ) is subsequently emptied into the process tank (PT) by means of a second pump (P 2 ), whereby the volume of the delivered amount of feed solution in the process tank (PT) is measured, in which the bleed solution is pumped out of the process tank (PT) by means of a third pump (P 3 ) into a second receiving space (G 2 ) for the bleed solution, whereby the volume of the delivered amount of bleed solution from the process tank (PT) in the second receiving space (G 2 ) is measured, and the bleed solution in the second receiving space (G 2 ) is subsequently emptied into a second tank (T 2 ), and whereby the first receiving space (G 1 ) is different from the second receiving space (G 2 ), and whereby at least one correction factor is always calculated from a comparison of the measured and calculated volumes of the bleed and feed solution delivered by the second and third pumps (P 2 ) and (P 3 ), with which said at least one correction factor the nominal delivery volume of the second and third pumps (P 2 ) and (P 3 ) are corrected in the next cycle.