Nuonuo is hugging a filter cartridge and smiling.

UDF Filter Cartridge – Efficiently Removes Odors, Residual Chlorine, and Organic Pollutants

UDF filter cartridge, also known as GAC (Granular Activated Carbon Filter) cartridge, is specifically designed for water quality optimization. It uses high-quality coconut shell activated carbon or coal-based activated carbon to effectively adsorb harmful substances in water, such as residual chlorine, odors, and organic pollutants, enhancing the cleanliness and taste of the water. It is typically used as the second-stage filter cartridge in RO water purifiers to further improve water quality. It is widely applied in both home and commercial water purifiers, making it an ideal choice for modern healthy water consumption.

A blue and white UDF filter cartridge placed on a flat surface
Structure
  1. White rubber ring: It prevents water leakage caused by gaps due to water pressure after the filter cartridge is installed; this end should be installed facing upwards.
  2. Housing
  3. Non-woven fabric: Located at both ends of the filter cartridge, it is used to intercept large particles of impurities in the water.
  4. Filter cotton layer: It further removes large particles of impurities in the water, protecting the core activated carbon layer.
  5. Activated carbon filter material: It has strong adsorption capacity, and efficiently removes odors, residual chlorine, and organic pollutants from the water.
A cross-sectional view of a UDF filter cartridge
Features
  • High adsorption performance. It utilizes high-quality coconut shell activated carbon or coal-based activated carbon for stronger adsorption capacity.
  • Improved water taste. It removes impurities such as odors, residual chlorine, and organic pollutants to enhance the drinking experience.
  • Multi-purpose compatibility. Universal standard filter cartridges ranging from 5" to 40", suitable for various water purification devices.
  • Eco-friendly and durable. Recommended replacement time is 3–6 months, offering long service life and reducing replacement frequency.
  • Simple installation design. Easy filter cartridge replacement, effortlessly adaptable, no professional tools required.
Working Principle

The raw water enters from the inlet of the filter cartridge, first passing through the non-woven fabric layer and the filter surface layer, intercepting large particles of impurities. Subsequently, the water flows into the granular activated carbon layer, where harmful substances in the water are effectively removed through the adsorption action of the activated carbon. After purification treatment, clean water flows out from the outlet, ensuring users can drink water without worry.

Since the two ends of the UDF filter cartridge are different, there is an installation direction. The water flow can only achieve the filtering effect by flowing from the direction of the hollow end cap to the direction of the white rubber ring end cap.

A cross-sectional diagram of the working principle of a UDF filter cartridge
Specifications
Table 1: UDF Filter Cartridge Specifications
Material Granular activated carbon or coal-based activated carbon
Type NORMAL / JUMBO
Height 5" / 10" / 20" / 30" / 40"
Out diameter 2.5" / 4.5"