Whole House Water Filter Cartridge 4.5 x 20, KDF Coconut Carbon

Whole house water filter replacement cartridge delivers cleaner, better-tasting water by reducing chlorine, odors, and heavy metals throughout your home. This 4.5" x 20" universal cartridge combines coconut shell activated carbon with KDF copper-zinc media to target lead, mercury, arsenic, cadmium, chromium, and hydrogen sulfide while maintaining steady flow. Built for simple swaps in most standard big blue housings, it helps cut maintenance with long service life and high capacity.

• Fits standard 4.5" x 20" (Big Blue) housings for many whole home filtration systems


• Reduces chlorine plus heavy metals like lead, mercury, arsenic, cadmium, and chromium


• Delivers dual-stage media: KDF copper-zinc targets chlorine/H₂S; carbon improves taste and odor


• Supports up to 100,000 gallons capacity with smooth, consistent water flow


• Installs easily with no modifications; made without glue or adhesives to help prevent off-odors

Use this replacement cartridge to refresh your whole home water filtration system and keep water quality consistent at every tap—showers, sinks, laundry, and appliances. The granular coconut shell carbon helps capture odor-causing impurities, while the KDF media targets chlorine and key contaminants often associated with metallic taste. Replace on a regular schedule based on your water conditions; it’s rated for up to 12 months to help reduce downtime and frequent changeouts. Grab yours today and keep your system performing as intended.

• Cartridge size: 4.5" x 20" (115 x 115 x 507 mm / 11 x 51 cm)


• Filter media: Granular coconut shell activated carbon + KDF copper-zinc alloy


• Capacity: Up to 100,000 gallons (varies by water quality)


• Service life: Up to 12 months (varies by water quality)


• Quantity: 1 cartridge


• Net weight: 7.5 lb / 3.4 kg