The Culligan CW-MF Sediment Filter removes scale, rust particles, sand, dirt, and silt from your drinking water. The package contains 2 filters and has a life of up to 3 Months or 12,000 Gallons. The filter has a Level 1, 30 Micron rating. The filter is recommended for use with city and well water supplies. This filter will last for up to six months before needing to be replaced, so you can enjoy clean, filtered water all year long.