The pump is linked to the engine, and it pumps fluid (regular oil) in to the torque converter. The turbine is linked to the gearbox, and it spins if the fluid from the pump hits it. The transmission filter allows to remove Dust and contaminants from the automatic transmission fluid, https://simonlygnu.gynoblog.com/33263769/5-simple-statements-about-filter-gearbox-explained