Pentair 5 micron String-Wound Polypropylene Cartridge Filter – 4.5″ x 20″


Sold in case quantities, each case contains 6 complete filter cartridges.

Introducing the Pentair WP-BB Polypropylene String-wound Series Filters With nominal micron ratings of 0.5, 1, 5, 10, and 25, and lengths in 10″ and 20″, the WP-BB Series stands as a reliable and economically priced solution for sediment reduction. Note that the anti-static agent may cause foaming during the startup of a new cartridge, and if foaming is a concern, the WPX-BB Series is recommended.

SKU: 355223-43 Category:


Introducing the Pentair WP-BB Series Polypropylene String-Wound Cartridges – a robust solution for efficient sediment filtration. Crafted from a durable polypropylene cord wound around a rigid polypropylene core, these cartridges excel in reducing fine sediment, including sand, silt, rust, and scale particles.

Key Features:

String-Wound Design: Crafted from a durable polypropylene cord wound around a rigid polypropylene core, the WP-BB Cartridges effectively reduce fine sediment, including rust, sand, and scale particles.

Economical Solution: As a budget-friendly choice, these cartridges provide an efficient and cost-effective solution for sediment reduction without compromising performance.

Versatile Sizing: Available in 10″ and 20″ lengths with a 4.5″ diameter, offering versatility to suit different filtration needs.

Wide Micron Range: With nominal micron ratings of 0.5, 1, 5, 10, and 25, the WP-BB Series accommodates various sediment sizes for comprehensive filtration.

Temperature Resilience: Capable of withstanding temperatures up to 165°F (73.9°C), ensuring durability in diverse applications.

High Flow Rates: The fibrous polypropylene media wound in a precise pattern around the core provides greater surface area, maintaining high flow rates between 10 and 65 GPM with minimal pressure drop.

Bacteria and Chemical Resistance: Suitable for a wide spectrum of sediment applications, including municipal and well water, and resistant to bacteria and chemicals, making them compatible with various industrial fluids.

Anti-Static Agent: The incorporated anti-static agent during the winding process mitigates electrical charges, enhancing overall cartridge performance.

WP-BB Series Polypropylene Wound Cartridges

Compatible Part or Model Numbers:

  • Ametek WP5BB20P
  • Culligan WP5BB20P
  • Hydronix SWC-45-2005
  • Liquidtec SWF-45-2005
  • Shelco MS20FP545
  • Shelco MS20PP545
  • USFilter / US Filter WP5BB20P

Compatible Housings:

  • Pentek 20″ Big Blue filter housings (#20 Big Blue)
  • Most brands’ 20″ x 4.5″ housings


Additional information

Weight 100 lbs
Dimensions 18 × 24 × 20 in
Filter size

4.5" x 20"

Micron Size

5 micron

Sediment Filter Type


Case quantity

6 pieces

Housing Dimensions

4.5" Diameter x 20" Tall