Garnet is considered one of the best water filter media due to its ability to achieve high filtration rates and longer durability. It serves as an efficient support bed in backwashing filters for high-density media and is used as the lower filtration layer. Its high density facilitates effective filter design and ensures stability in the media. Additionally, garnet sand has a high specific gravity, making it an ideal lower layer. With its size, it can effectively filter particles in the range of 10-20 microns.