Pentair 155390-03 Semi Rigid Bag Filter 25 Micron Size 5

Product Description

The PENTAIR 155390-03 is a Size 5 semi-rigid polypropylene bag filter rated at 25 microns, designed for liquid filtration applications in industrial, commercial, and process systems. Measuring 4 inches in diameter and 18.5 inches in length with 1.75 square feet of filter area, this bag filter captures particulate contaminants from process fluids, water, and compatible liquids. Its semi-rigid construction helps the bag maintain shape under flow, reducing bypass risk and supporting consistent filtration performance. Licensed filtration technicians and maintenance professionals typically install this filter in standard Size 5 bag filter housings as part of routine system maintenance or contamination control programs.

This filter is suited for residential, commercial, and light industrial liquid filtration systems that require a Size 5 bag configuration. Common applications include process water filtration, cooling tower side-stream filtration, chemical processing, and general-purpose fluid handling where 25-micron particulate removal is required. The polypropylene construction offers broad chemical compatibility, making it appropriate for a range of fluid types beyond plain water.

Key Features

• 25-micron filtration rating for reliable particulate capture in liquid service
• Semi-rigid body construction helps maintain bag shape and minimizes bypass under flow
• Polypropylene material provides broad chemical resistance
• Size 5 bag dimensions: 4 inches diameter by 18.5 inches long
• 1.75 square feet of filtration area supports adequate flow capacity

Compatibility

Designed as an OEM-style replacement for standard Size 5 bag filter housings accepting a 4-inch diameter by 18.5-inch bag filter.

Installation Notes

Bag filter replacement should be performed by a qualified technician following the housing manufacturer's service procedures. Always depressurize and isolate the filter housing before opening and removing the spent bag to prevent fluid release. Verify that the new bag is fully seated and the housing lid or closure ring is properly secured before returning the system to service. Consult applicable facility safety and plumbing codes for disposal of spent filter media.