If you find your water flow rate slowing down it's a sign you need to replace your filter cartridges. Tier1 offers an assortment of replacement cartridges coming in all standard sizes to fit any housing system you have installed. Replacement cartridges and kits help ensure that your system is up and running at top performance and reducing the unwanted contaminants that find their way into your water. Used in a variety of applications ranging from pre-filtration to single system protection, our filters are tested to reduce contaminants that would cause harm to your home and health. Ensure your filters are performing optimally with Tier1 and let us protect every drop.