I'm planning to get rid of it altogether eventually...I think I'm going to order an "AquaSilencer" for this overflow box...overall the system is very quiet except for some gurgling in the overflow box...I need to get rid of the filter sponge anyway so I might as well use something that can make it even quieterJust remember to either get rid of or rinse that pre-filter sponge pretty regular.Those things tend to get nasty and can cause high nitrates if there not properly maintained.