DFS-5221

3 Stage Big Blue Whole House Filter

  • Streamlined frame design makes the filter element maintenance friendly. 
  • Hidden fittings and tubing for a simple and beautiful case design.
  • Strategically located tubing protects from damage and contamination.
  • Built-in pressure gauge and water hammer arrestor.
  • Automatic flushing extends ultrafiltration membrane life. 
  • Adopt high pressure and chemical resistance spiral wound ultrafiltration membrane.
  • Choose the filter configuration based on your needs.


The Ideal Whole-House UF Water Filter for Your Home and Business

With its advanced features and durable construction, the DFS-5221 Whole-House Filter offers reliable, high-performance water purification that meets the needs of both residential and commercial properties.


Convenience and Durability

The DFS-5221 has been designed with both function and aesthetics in mind. Unlike typical 20” three-stage filters, the DFS-5221 stands taller at 900 mm (or an alternative size of 720 mm), providing extra space for easier maintenance. This added height ensures that DIY consumers and maintenance personnel can replace the filter without damaging the filter housing, particularly when changing the UF (ultrafiltration) filter. The self-flushing mechanism is routed internally, keeping the unit looking clean and streamlined, with no visible tubing that could detract from its sleek appearance.

The filter’s base is designed with L-shaped guards to prevent potential rodent damage, making it suitable for outdoor settings such as balconies or gardens. The frame itself is designed with an S-shaped streamlined structure, which makes it easier to access the filter housing and perform maintenance tasks. The matte black powder-coated finish further enhances its professional appearance, offering both a refined look and long-lasting protection against wear and tear.

Advanced Three-Stage Filtration


The DFS-5221 utilizes a three-stage filtration system to provide comprehensive water purification. The first stage features a PP (Polypropylene) filter, which effectively removes larger particles and sediments, ensuring that your water is clear and free of debris. The second stage utilizes a CTO (Chlorine Taste and Odor) filter, which enhances the taste and quality of your water by removing chlorine, volatile organic compounds, and other harmful chemicals. The final stage uses a UF (Ultrafiltration) membrane, capable of filtering out bacteria, viruses, and other microorganisms, ensuring that the water is safe and clean.

The spiral-wound UF membrane used in the DFS-5221 is a notable upgrade over the common hollow-fiber UF membranes found in many whole-house UF products. This specialized membrane can withstand higher inlet pressures (up to 6 kgf/cm²) and supports greater flow rates, making it ideal for high-demand environments. The spiral-wound membrane also offers superior self-cleaning efficiency, ensuring a longer lifespan and higher filtration performance.

Self-Cleaning Function for Extended Filter Life

Another major advantage of the DFS-5221 is its self-cleaning function, which helps extend the life of the UF filter by preventing blockages, scaling, and impurities from accumulating. This feature operates on a timed automatic cycle, cleaning the UF filter every 8 hours for a duration of 30 seconds. Each cleaning cycle consumes just 5.4 L of water (at 3 kgf/cm²), ensuring that the system maintains high performance with minimal water wastage. With this self-cleaning feature, users can enjoy reliable filtration without the need for frequent manual maintenance or filter replacements.

Monitoring Performance with Pressure Gauges

To ensure that your filtration system is operating efficiently, the DFS-5221 comes equipped with two pressure gauges. These gauges allow you to easily monitor pressure levels and determine when maintenance is needed. If the pressure rises beyond the normal operating range, it may indicate that the filter is clogged or that it’s time to replace the filtration components. This feature gives homeowners and business owners peace of mind, knowing that their system will continue to perform at optimal levels without constant manual intervention.

Water Hammer Protection for Added Security

Another feature of the DFS-5221 is its built-in water hammer arrestor. This component prevents damage to the filtration system caused by sudden pressure spikes, commonly known as water hammer. With a maximum working pressure of 10 BAR, the water hammer arrestor ensures that the filter and piping structure remain intact, even in the event of abrupt changes in water pressure.

Superior Versatility

The versatility of the DFS-5221 Whole-House Filter makes it ideal for a wide range of applications.

  • Residential Homes: Whether you live in a single-family home, a multi-story building, or a townhouse, the DFS-5221 can be installed at the main water inlet to provide a reliable solution for ensuring clean, safe water throughout your entire property.
  • Small Businesses: From cafes and restaurants to beauty salons and office buildings, clean water is essential for food preparation, hygiene, and comfort. The DFS-5221 guarantees high-quality filtration that meets these needs.
  • Commercial Buildings: Office buildings, hotels, and manufacturing facilities with high water consumption can benefit greatly from the DFS-5221’s superior flow rate and filtration capacity.
  • Outdoor Spaces: Due to its durable construction, the DFS-5221 can be installed in outdoor environments such as gardens, patios, or balconies. Its weather-resistant design, complete with dust and splash protection, makes it a reliable choice for spaces exposed to the elements.

The DFS-5221 Whole-House Filter’s advanced design, powerful flow rate, self-cleaning functionality, and robust construction make it an ideal choice for both residential and commercial applications. With this filter, you can ensure that your water is free of harmful impurities, providing you with clean, safe, and great-tasting water throughout your home or business.