Ideal for use with untreated well water, the RS16 OmniFilter water filter cartridge is a replacement designed for use in most 10x4.5 filtration system housings. By using polypropylene in its makeup, this filter helps to ensure micro-organisms that can be common in well water cannot live or grow in this filter. This filter is also highly effective at reducing sediment, sand and dirt, ensuring that you serve the highest quality water throughout your entire home! Get peace of mind when it comes to the quality of your water by ordering the RS16 OmniFilter whole house water filter cartridge replacement from us today!