Understanding Water Purifier Filter Types and Their Functions

Water purifiers rely on a variety of filter cartridges to ensure effective filtration. A single ultra-filtration (UF) membrane or reverse osmosis (RO) membrane alone isn't sufficient for comprehensive purification. Typically, household water purifiers use a combination of multiple filter stages. Below is an overview of commonly used filters beyond the UF and RO membranes, explained by experts at Hansdun.

1. PP Melt Blown Filter Cartridge

Material: Made from non-toxic, tasteless polypropylene particles.
Function: Removes sediments like mud, rust, colloids, and parasites. Often used as the first filtration stage.
Replacement Cycle: Every 2–4 months.

2. Yarn Filter Cartridge

Material: Wound yarn on a core, typically made of polypropylene or cotton.
Function: Filters out suspended particles, sand, and other impurities. Suitable for various liquid filtration.
Replacement Cycle: Every 2–4 months.

3. Carbon Filter Cartridge

Types: Granular Activated Carbon (GAC) and Compressed Activated Carbon (CAC).
Function: Known for strong adsorption properties, eliminates odors, colors, chlorine, and organic impurities.
Replacement Cycle: Every 6–8 months.

4. PP Pleated Filter Cartridge

Material: Made from pleated polypropylene fabric.
Function: Provides high surface area for efficient sediment and particle removal. Often used in pre-filtration processes.
Replacement Cycle: Every 6–12 months.

5. High Flow Pleated Filter Cartridge

Material: Advanced pleated design with durable polypropylene or polyester.
Function: Filters high flow rates while maintaining low pressure drop. Ideal for industrial applications.
Replacement Cycle: Varies by application, typically every 6–12 months.

6. Swimming Pool Filter Cartridge

Material: Polyester fabric or similar durable materials.
Function: Removes debris, particles, and contaminants from pool water, ensuring clarity and hygiene.
Replacement Cycle: Clean regularly, replace every 12–24 months.

7. Carbon Fiber Cartridge

Material: Made of activated carbon fibers.
Function: Provides effective removal of chlorine, organic impurities, and odors, enhancing water taste.
Replacement Cycle: Every 6–8 months.

8. Filter Bag

Material: Non-woven fabric or felt made from polypropylene or nylon.
Function: Captures large particles and contaminants in liquid filtration systems.
Replacement Cycle: Replace as needed depending on contamination levels.

9. Filter Housing

Material: Stainless steel, plastic, or aluminum alloy.
Function: Encases filter cartridges or bags, protecting them and ensuring proper filtration.
Maintenance Cycle: every 12–24 months.

10. Air Compressor Filter

Material: Specialized filter media for air systems.
Function: Removes oil, water, and particulates from compressed air, ensuring system efficiency.
Replacement Cycle: Every 3–6 months.

Choosing the Right Filter

Not all water purifiers include every filter type listed above. Certain filters are selected based on specific regional water quality requirements. Understanding these filter types and their roles ensures you can make an informed decision when purchasing a water purifier.