WHOLE HOUSE FILTER REPLACEMENT. The main tank complete EQ-300 whole house water filters, high-capacity, 3-stage, dual-chamber water filter unit is maintenance-free for 3 to 5 years or 300,000 gallons of use. This Equinox whole house filter never used. The item “Equinox EQ-300 whole house home water filter” is in sale since Monday, March 4, 2019. This item is in the category “Home & Garden\Home Improvement\Plumbing & Fixtures\Water Filters”. The seller is “dentalqi56″ and is located in San Ysidro, California. This item can be shipped to United States.