Particle filter that is easily cleaned by turning the lower part, which means that two "rollers" are rotated around the insert and suck out what is stuck. Particles are led down to the bottom of the filter where the water is flushed out, either in a bucket or by attaching a hose and then the flushing water leads to the floor drain or similar.
This process avoids releasing the pressure and threading the filter housing leading to the risk that it becomes leaky when you need to change the filter insert, which needs to be done on ordinary cartridge filters with a cotton and carbon cartridge.