Express Water Whole House Replacement Filter Set (3-Pack) – Carbon Block, KDF, Polyphosphate | WH300SCKP

Cleaner water for every corner of your home

Express Water's Whole House Replacement Filter Set delivers a cohesive, three-stage filtration solution for your home’s incoming water. Designed to fit standard 4.5" × 20" cartridges and compatible with WH300SCKP systems, this pack targets a broad range of impurities, helping to improve clarity, taste, and overall water quality from every faucet, shower, and appliance.

What’s included in the 3-pack

• Activated Carbon Block cartridge for taste, odor, and sediment removal
• KDF heavy metal filter to reduce metals like iron, lead, and chromium
• Polyphosphate anti-scale cartridge to help limit mineral buildup and scale formation

How the three stages work

• Carbon block filter: dense coconut-shell carbon removes VOCs, chlorine byproducts, and other contaminants while preserving beneficial minerals
• KDF stage: copper and zinc granules catalytically reduce heavy metals and inhibit bacteria growth
• Anti-scale stage: polyphosphate forms a protective barrier that helps minimize scale and sediment in pipes and appliances

Performance you can count on

Rooted in high-efficiency design, these filters are engineered for minimal pressure loss, so you’re less likely to notice a drop in flow. The system supports an extended filtration life, with the potential to handle up to 100,000 gallons of water, depending on your source quality. When used under typical home conditions (45–80 psi, 40–100°F), you can expect steady performance without frequent maintenance.

Practical benefits for daily life

Enjoy clearer water for drinking and cooking, softened shower water, and better-tasting ice. By filtering throughout the home, you may help protect appliances like dishwashers and laundry machines, and you may notice less mineral buildup in sinks and fixtures over time. These outcomes are possibilities and depend on your actual water quality and usage.

Simple installation and care

Set up is designed for dry, level spaces away from freezing temperatures and direct sunlight. Replacement timing varies by water quality, temperature, and incoming pressure, with the general guidance of 6–12 months or up to 100,000 gallons.