Under-sink water purifiers, also known as under-sink water filtration systems or under-counter water filters or UTC, are devices designed to purify and improve the quality of drinking water directly at the point of use. They are typically installed under the kitchen sink and are connected to the existing water supply, providing clean and filtered water through a separate faucet or as a part of the main kitchen faucet. There are various types of under-sink water purifiers available, each with its unique purification methods and features. Some common types include: Carbon Filters: These use activated carbon to adsorb and remove impurities such as chlorine, sediment, bad taste, and odor from the water. Reverse Osmosis (RO): RO systems use a semipermeable membrane to remove a wide range of contaminants, including heavy metals, dissolved solids, fluoride, and more.