The Wave 3D lasts the full advertised 30 days and then some. Only Fresh Products has a patented fragrance load that gives it 3X more fragrance than the closest competitor. The unique two-sided design allows the screen to eliminate 99% of splash back on both sides. This prevents incorrect installation which can result in a mess around the urinal. The Wave 3D makes it easy, simply place it over the drain in the urinal and you’re done.