RainFlo Preferred 20 inch 50 Micron Pleated Filter Cartridge

RainFlo Preferred 20 inch 50 Micron Pleated Filter Cartridge
Premium 20" x 4.5" (Full Flow and Big Blue size), 50 micron nominal pleated cellulose filter cartridge for general water filtration purposes. Each cartridge is individually shrink wrapped.
Our Price$34.95
List Price $40.00
Weight 3

Product Description:

The Premium pleated cellulose cartridges are manufactured from a durable, non-woven polyester material that is suitable for a wide range of filtration uses. The filter media is pleated around a polypropylene core for added strength and the ends are completely molded into a vinyl plastisol base. Embedding and sealing each end of the pleated media in this fashion fuses the three components together forming a unified end cap and gasket. The overlap seam is sonically welded to reduce internal bypass improving filtration efficiency.

The 20" x 4.5" Full Flow/Big Blue version has more than 16 square feet of filtration surface area. The media is pleated to maximize dirt-holding capacity and extend the time period between changes or cleaning.

Filter Cartridge Gasket
RainFlo Preferred Filter


  • Pleated design increases surface area and maximizes dirt holding capacity
  • Integrated gasket for improved sealing
  • Can be washed with clean water to increase effective lifespan
  • Polyester cellulose media is bacteria and chemical resistant
  • Versatile and reusable, allowing for a variety of uses
  • Low pressure drop and high flow rate


  • General water, UV and R.O. pre-treatment
  • Residential and commercial water treatment
  • Pre-filtration of sterile water and ultrapure water
  • Industrial water


  • 50 micron nominal filtration
  • Filter media: Polyester cellulose
  • Core: Polypropylene
  • End cap: Vinyl plastisol
  • Outer diameter: 4.5"
  • Inner diameter: 1.1"
  • Maximum operating temperature: 125° F
  • Maximum differential pressure: 58 PSI at 68° F
  • Recommended change-out at 14-20 psi drop or one year, whichever happens first