OMNIFilter BF35-S-S06 Heavy-Duty Whole House Filter, Light Blue Heavy-duty whole house water filter system for large homes Built-in water bypass feature allows you to change cartridges without turning off the main water supply Greater than 50% more capacity, flow rate and cartridge life than standard 3/4 housings Includes RS18 cartridge to reduce sediment, sand, dirt, and rust particles For use in large homes with 1" incoming water lines