Hydronix SWC-45-1005 String Wound Filter 4.5" OD X 10" Length, 5 Micron The HD-950 water filtration housing can be used to hold the Liquatec SWF-45-1005 Water Micron Rating (Nominal): 5 Micron. Reduces sand, silt, rust, dirt and scale particles. Liquatec SWF-45-1005 String Wound Dimensions: 10 L x 4.5'' W. Filter Media: Polypropylene Fiber Cord.