APEC FILTER-MAX90 – US Made 90 GPD Replacement Filter Set for ULTIMATE Series RO System (Standard 1/4 Inch Output)

Premium filtration, USA-made reliability

Meet the APEC FILTER-MAX90—an all-in-one, US-made 5-stage replacement set designed for high-flow Ultimate series reverse osmosis systems. Built to endure, this kit combines premium filtration media with a membrane that has been lab-tested for strong rejection rates. The result is dependable performance that helps safeguard your RO system while delivering consistently refreshed drinking water.

The 5 stages work together to reduce common household water concerns while you’re at home:

• Stage 1: high-capacity polypropylene sediment filter removes dirt, rust, and sediment for smoother filtration and longer cartridge life.
• Stage 2: premium extruded carbon block filter targets chlorine, taste, odors, cloudiness, colors, and VOCs with uniform density for minimal channeling.
• Stage 3: second premium extruded carbon block continues to refine taste and purity, helping to prevent downstream off-notes.
• Stage 4: a high-rejection 90 GPD TFC RO membrane tackles a wide range of impurities, including heavy metals and dissolved contaminants.
• Stage 5: an advanced coconut shell refining carbon post-filter removes any residual taste from the tank.

Why choose the MAX90 set?

• USA-made design aimed to last longer; the kit is built to extend the life of your RO system and reduce filter changes.
• Premium pre-filters last over 12 months; the membrane and post-filter can offer 3–5 years between changes under typical use.
• Lab-tested 90 GPD membrane provides high rejection rates under household conditions for crisper, clearer water.
• Compatibility with APEC RO-90, RO-PERM, and most standard 10 inch x 2.5 inch housings for straightforward installation.

For over 20 years, APEC has been a leading manufacturer of high-performance RO systems, and this MAX90 set reflects that legacy with a focus on durability, consistency, and practical filtration performance. In everyday use, you may notice water that tastes cleaner and looks clearer, with less chlorine-like aftertastes and odors. As with any filtration system, results can vary based on your local water quality, but the MAX90 is designed to provide a reliable upgrade path for many standard RO configurations.