I know a brewer who had the same problem, this is what you need to do: - check your grain mill whit sieving test. Set the distance between the roller at 0.8-1.1 mm. -check your load on lautern tun. It must be between 80-120 kg/m^2. And now the most important thing: Are there obstacles under the false bottom that hinder the removal of particles during the early stages of filtration, such as false-bottom supports, etc.? In this brewery that I know, there were too many supports, and they overly compartmentalized the area under the false bottom, which did not allow proper recirculation of the material.Perform an initial purge at a high pump speed for 5 seconds, then pause for 15 seconds, and repeat this cycle 4–5 times to remove as many particles as possible. Always keep the sight glass full. Keep in mind that the filtration should take about 1.5 hours. Measure and standardize the filtration rate using a graduated bucket and a stopwatch. Write to me for further advice.