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The Watts SF1-40 is a string wound water filter cartridge used in the following applications:
The Watts SF1-40 String Wound 40"x2.5"- 10-Pack- 1 mic is made with 100% pure polypropylene fibers. This Watts water filter features 1 micron filtration. This string wound filter measures 2 1/2 inches x 40 inches. Change this 1 micron sediment filter every 6 to 12 months.
The Watts SF1-40 specifications: