Quiet Outlet Diffuser for Rear-Filter Aquariums

A slotted box that sits on the end of the filter return hose in a corner of the tank. Water leaves through 51 times the hose area, slowly and quietly, and a snail on one face cannot block it. A loose return hose splashes, and if a snail sits on its end it can spray water out of the tank. This diffuser takes the hose in a socket on its back face and lets the water out through slotted faces on the other sides. The outlet area is about 51 times the hose's, so the water leaves at around 1 cm/s at 1…

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