In the wort filtration process, sometimes the filtration speed is very slow or even stops, thus making the filtration time much longer and affecting the quality of the wort and the normal brewing process. The main reasons for this situation include: poor grain quality or poor saccharification, resulting in poor sugar composition, high viscosity, or wrong pulling operation. Therefore, here are some emergency solutions.
Stop the Rattler and start the Rattler rake to loosen the grain bed.
The larger fluidization tank is usually equipped with anti-scouring ring. So we can spray hot water (75-78℃) from the bottom to help loosening. If the fluidization speed still does not improve, then we can backwash the water and start the rake for agitation for 2-4 minutes at the same time. If necessary, the speed of the rake can be increased to break the original grain bed and then the wort can be allowed to wait 5-10 minutes to form a new grain bed before restarting the mill. In addition, we should pay attention to the insulation of the raking machine. And the temperature of the filling water should not be too low.
Slow down the pump/grinder to avoid a “vacuum” situation.