The Tier1 RO5 Filter Set 2 is a complete replacement pack designed for Tier1 5-stage reverse osmosis systems. It includes a 5-micron sediment pre-filter, a 5-micron carbon block pre-filter, and a 10-micron granular activated carbon (GAC) post-filter (inline polishing filter). This set covers stages 1, 2, and 5 of your Tier1 RO system and is intended to be replaced every 6 months to maintain optimal performance and water quality.

This filter set is specifically engineered to fit Tier1 5-Stage Reverse Osmosis Systems, including the Tier1 RO-PRO-5 and similar Tier1 RO units that use standard 10-inch filter housings. The inline GAC post-filter uses quick-connect fittings for easy installation. It is not designed for other brands, so always confirm your system is a Tier1 5-stage RO before ordering.

Tier1 recommends replacing this pre-filter and post-filter set every 6 months for standard household use to ensure consistent contaminant reduction and to protect the RO membrane from premature fouling. Homes with higher sediment or chlorine levels may need more frequent changes. Note that the RO membrane itself is a separate component and is typically replaced every 2–3 years.

The 5-micron sediment filter captures dirt, rust, sand, and silt, protecting downstream filters and the RO membrane. The 5-micron carbon block filter reduces chlorine, taste, and odor, which also extends membrane life. The 10-micron inline GAC post-filter polishes the water just before dispensing, removing any residual tastes or odors picked up in the storage tank. Together with the RO membrane, the Tier1 5-stage system delivers clean, crisp drinking water.

Yes. After replacing the filters, turn on the cold water supply, allow the RO tank to fill, and then drain the tank completely 2–3 times before using the water. This flushes out carbon fines and air from the new filters and ensures your Tier1 RO system delivers clean, great-tasting water at full efficiency.