Specifications:

• Dual Grade 25/1micron 4.5" x 20": 25 micron outside and 1 micron inside
• Dual grade filter cartridges will remove 2.3 times the amount of sediment that standard spun or string wound filters remove.
• Flow rate 20 gallons per minute at 1 PSI pressure drop.
• Dual Grade  Series cartridges are manufactured from 100% purepolypropylene and are sized for use in our Big Bluefilter housings..
• Dual Grade Series cartridges are designedfor purity and will not impart taste,odor or color to the liquid beingfiltered.
• Additionally, the polypropylene construction provides chemical resistance and is not prone to bacterial attack.
• The Dual Grade Series advanced design combines selective final filtration with appropriate pre-filtration to achieve up to three times the dirt-holding capacity of similar size sediment cartridges and many more times that of standard spun orstring-wound cartridges.
• This performance enhancement is achieved by combining two separate gradient layers in one filter.
• The larger diameter of the pre-filter reduces the particle load to the postfilter, allowing it to operate at higher velocities.
• The effective filter depth is increased to a full 233% of standard spun-polypropylene or string-wound filters.
• This increased depth provides for very high particulate reduction efficiencies and added loading capacity.
• The unique design and performance characteristics of the Dual Grade Series cartridges make them an excellent choice for all residential, rural, municipal and commercial applications.
• Maximum water temperature 145F
• Dimensions: 4.50" x 20" (114 mm x 508 mm)
• Flow rate when new:  <1 psi @ 20 gpm (<0.1 bar @ 76 Lpm)