Pentair 355222-43 Cartridge Filter 1 Micron 4.5 in Big Blue

Product Description

The PENTAIR 355222-43 is a string-wound polypropylene cartridge filter rated at 1 micron, designed for sediment reduction in residential and light commercial water filtration systems. Built for Big Blue filter housings, this cartridge measures 4.5 inches in outside diameter and 20 inches in length, making it a standard fit for high-flow whole-house and point-of-entry filtration applications. It handles operating pressures up to 6 psi and a temperature range of 40 to 165 degrees F. The polypropylene string-wound construction provides consistent depth filtration, trapping fine particulate throughout the media rather than just at the surface. Licensed plumbers and water treatment technicians are the typical installers.

This cartridge filter is suited for whole-house sediment filtration, pre-filtration ahead of softeners or RO systems, and general plumbing protection in residential and light commercial installations. It fits standard Big Blue housing configurations commonly used in point-of-entry applications where high flow rate and sediment control are required. The 1-micron rating targets fine particulate including silt, sand, rust, and similar debris before it reaches downstream fixtures, appliances, or treatment equipment.

Key Features

• 1-micron rating captures fine sediment including silt, sand, and rust particles
• String-wound polypropylene construction provides depth filtration throughout the media
• Fits Big Blue filter housings — 4.5 inch OD, 20 inch length
• Rated for water temperatures from 40 to 165 degrees F
• Maximum operating pressure of 6 psi
• Single-cartridge packaging, sold individually

Compatibility

Designed as an OEM-style replacement cartridge for Big Blue filter housings accepting a 4.5 inch OD by 20 inch string-wound cartridge.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC guidelines. Shut off the water supply and relieve system pressure before opening the filter housing to replace the cartridge. Inspect housing O-rings for wear and lubricate with a food-grade silicone grease before reassembly. Do not exceed the rated operating pressure or temperature limits of the cartridge.