Parker 11R20A String-wound Cartridge Filter 50 Micron

Product Description

The PARKER 11R20A is a string-wound cartridge filter designed for plumbing and water treatment applications. It measures 20 inches in length with a 2.5-inch outside diameter, providing a high-volume filtration surface area suited to demanding flow conditions. The filter media is cotton wound in a graduated density pattern over a polypropylene plastic core, delivering a 50-micron nominal rating that captures sediment, sand, rust particles, and other suspended solids. The cotton media carries an FDA material grade, making it suitable for potable water systems. Plumbers and water treatment technicians install this filter in standard filter housings as part of point-of-entry or point-of-use filtration assemblies.

This filter is used in residential and light commercial water supply systems where moderate sediment loads require reliable particulate reduction ahead of softeners, RO systems, or other downstream equipment. The 50-micron rating targets coarser sediment in pre-filtration stages, extending the service life of finer downstream filters. The maximum working temperature of 120 degrees F makes it appropriate for cold and ambient-temperature water lines. String-wound construction resists unloading of captured particles under normal flow fluctuation, maintaining filter integrity throughout its service cycle.

Key Features

• 50-micron nominal rating for coarse sediment and particulate removal
• Cotton string-wound media over a polypropylene plastic core
• FDA-grade material suitable for potable water applications
• 20-inch length and 2.5-inch OD fits standard 20-inch Big Blue and compatible filter housings
• Maximum working temperature of 120 degrees F
• Graduated density winding reduces particle unloading during flow changes

Compatibility

Designed as an OEM-style replacement for standard 20-inch string-wound cartridge filter housings used in residential and commercial water filtration systems.

Installation Notes

Installation is performed by a licensed plumber or qualified water treatment technician. Shut off the water supply and relieve system pressure before opening the filter housing. Inspect the housing O-ring for wear and lubricate it before reinstalling the cap. Follow local plumbing codes, including applicable IPC requirements, for potable water filtration installations.