Storm drain inlet filters use strong rare earth magnets to hold itself in place on the storm drain grate. This makes installing the storm drain inlet protection device simple. You don't have to lift the storm drain grate when installing or removing the stormwater BMP. The heavy-duty material will filter both sediment and oil, as well as trash and debris. The curb inlet guard can also come with an overflow port to prevent puddling and pooling during heavy rainfall.