Re: Bosch SGS43A52GB/35 slow emptying
The detritus in the top corner of the matrix (adjacent the air valve) could be the problem though it would have to be in quite a state for that to be the case. In order to double check the whole drain system is clear, remove the flap valve in the sump, put the drain hose onto the cold tap and flush a blast of water into the tub. If that flows in that direction OK then that confirms the matrix is not the issue. The pump itself or the flap valve could be at fault.