How often should the solutions in the Buffer Tray for the QIAxcel System or QIAxcel Advanced be replaced?
FAQ ID -1840

The solutions used with the QIAxcel System or QIAxcel Advanced should not have to be changed for the life of the Gel Cartridge (based on the number of runs).  However, if any contamination is suspected, the Buffer Tray should be cleaned and the buffers should be changed immediately.