A typical unitank cleaning regime includes;
- Ambient water prerinse to flush out residual yeast and loose gross dirt. This generally requires manual intervention to remove the dried on krausen which sticks to the side wall of the fermentation vessel and is very difficult to remove without some mechanical scrubbing.
- Hot cleaning which involves the recirculation of the cleaning solution form an ancillary vessel via a pump to the vessel spray balls before exiting the vessel via the bottom outlet valve and flowing back to the wash vessel. The wash vessel and pump are typically part of a CIP skid which will has its own control system, instrumentation, water rinse tank, cleaning solution dosing pump, etc..
- Final water rinse: performed to flush out the residual cleaning solution. This is typically a time-based operation with clean water pumped into the vessel via the spray balls at a target pressure. A conductivity or pH check is frequently performed on the final rinse water to confirm removal of the cleaning solution. The amount of water required to flush out the residual cleaning solution is not insignificant.