System for recovering a cleaning solution and printing machine

A system for recovering a cleaning solution for use in a printing machine, wherein the system comprises:

• a drain tank with a calming section and a recovery section being fluidically connected to the calming section and being arranged above the calming section, and
• an inlet pipe for feeding a used cleaning solution into the calming section of the drain tank, wherein the used cleaning solution comprises a cleaning fluid and an ink,
• wherein the recovery section is separated in the drain tank from the calming section by means of a filter element, in the drain tank above the calming section and below the recovery section, which is adapted to at least partially retain the ink in the calming section such that a recovered cleaning solution is collected in the recovery section, wherein the filter element surrounds a portion of the inlet pipe within the drain tank, and wherein along a height direction of the drain tank an ink concentration gradient is realized at least partially due to the action of gravity.