A waterless floor drain trap is a device that fits into the floor drain in your laundry room and acts as a barrier to prevent sewer gases from entering the home without the use of a water priming device.
Most standard homes have water priming devices. These devices use water to form a seal that prevents sewer gases from coming into your home. Some drain traps use potable drinking water to form a seal, while others use condensation from your furnace to perform this function. Water-primed floor drains can leak, wasting up to 53 litres of water per day.