The Purtrex PX20-20 is a 20-micron nominal sediment filter cartridge. It is engineered with 100% pure polypropylene melt-blown fibers in a true-gradient density construction, meaning the outer layers trap larger particles while the inner layers capture finer sediment. This design maximizes dirt-holding capacity and extends the usable life of the cartridge compared to standard spun or string-wound sediment filters.

The Purtrex PX20-20 measures 20 inches in length with a 2.5-inch outer diameter, making it compatible with most standard Big Blue-style and slim-line 20" housings that accept a 2.5" OD cartridge. It features an open-open double open end (DOE) configuration, ensuring a drop-in fit for residential, commercial, and light industrial filter housings designed for standard 20" cartridges.

Yes. The Purtrex PX20-20 is manufactured from FDA-compliant polypropylene and is tested and certified to NSF/ANSI Standard 42 for material safety and structural integrity. Because it is free of binders, adhesives, surfactants, and antistatic agents, it is well-suited for potable water, food and beverage processing, and pre-filtration ahead of reverse osmosis or carbon block systems.

The service life of the Purtrex PX20-20 typically ranges from 3 to 6 months, depending on incoming water quality, sediment load, and flow demand. At its rated flow of up to 10 GPM, it delivers high dirt-holding capacity thanks to the gradient-density polypropylene structure. For best performance, replace the PX20-20 when you notice a pressure drop of 15 PSI or more, or at the 6-month mark—whichever comes first.

The Purtrex PX20-20 is specifically designed to reduce suspended solids such as sand, silt, rust flakes, scale particles, and other sediment down to 20 microns in size. It does not remove chlorine, dissolved chemicals, or biological contaminants—those require a carbon or specialty cartridge. The PX20-20 is most effective as a pre-filter in multi-stage systems, protecting downstream equipment like RO membranes, UV lamps, and carbon blocks from sediment fouling.