HDX HDX4PF4 Pleated High Flow Whole House Water Filter: Reduces Sediment - 30 Micron Water Filter Universal Fit - Fits Glacier Bay high flow basic filtration systems HDG4HS4 and all major brands of large capacity household water filtration systems Reduces sediment, NSF certified 30 micron filter Replace this filter every 3 months Questions? Contact our customer support center at 1-800-247-1087