It is not recommended to add it, because the FOTILE sink dishwasher produces less residue and is easy to clean. Besides, there is also a garbage collection basket inside the dishwasher to filter out all the leftover food. There will be no leftover food entering the sewer, so there is no need to add a garbage collector. I have been using the sink dishwasher for so long and it has always been very good. There is no blockage or odor in the sewer pipe.