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GreenStory Polypropylene String Wound Element Polypropylene Core Sediment Water Filter 4-Pack, 2-1/2'Dia x 10' L 5 Micron 8 gpm, GSGWFWE5S3EX1-4: Home Improvement. Buy GreenStory Polypropylene String Wound Element Polypropylene Core Sediment Water Filter 4-Pack, 2-1/2"Dia x 10" L 5 Micron 8 gpm, GSGWFWE5S3EX1-4: Replacement Pitcher Water Filters - ✓ FREE DELIVERY possible on eligible purchases. Tested and Certified by WQA to: NSF/ANSI/CAN 61, NSF/ANSI 42 - Component, NSF/ANSI 372, CSA 483.1 。 Polypropylene String 。 Max temp 180F (82C) 。 Filtration of organic acids, alkalis, solvents and many other chemicals. Very effective in low viscosity solutions. 。 Polypropylene core 。 GSGWF string wound elements are manufactured on custom, high-speed, computer- controlled machines for perfect thread spacing. Standard diameters are 2.5 and 4.5 inches.。 。