Filtrete Standard Capacity Whole House System Refill 2-pack String Wound. Filter waters throughout your home protecting your plumbing and appliances from Sand Sediment Silt and Rust with 10 micron filter rating. Great for 2 or less bathroom households. For use in 3WH-STD-S01 or similar standard drop-in style housing using 2.5 diameter x 10 length replacement filter. Other filter options available in this series are pleated string wound carbon wrap and grooved filters. Filter life replacements available in 3 and 6 month versions.