Whole House Water Filter Replacement Cartridge 4.5"x20" CTO Carbon — 2 Pack

Deep Filtration, Cleaner Water — Every Day.

The Ninety CTO Activated Carbon Block Replacement Cartridge delivers powerful, whole-home water purification — removing chlorine, unpleasant odors, and dissolved contaminants before they reach your taps, shower, or appliances. Supplied as a 2-pack for uninterrupted protection.

Key Features

• Deep chlorine removal: Activated carbon block eliminates up to 99% of chlorine and chloramines, dramatically improving the taste and smell of your water.
• 5-micron filtration: High-density carbon block traps fine particles, sediment, and dissolved impurities for visibly cleaner water.
• Universal fit (4.5" × 20"): Standard Big Blue format — compatible with most whole-home filter housings on the market. No modifications required.
• Easy installation: Drop-in replacement, installs in minutes without tools or plumber assistance.
• 2-pack value: Keep a spare on hand and never miss a replacement cycle.

Technical Specifications

• Cartridge size: 4.5" × 20" (Big Blue standard)
• Filter media: CTO activated carbon block
• Filtration rating: 5 micron
• Function: chlorine reduction, odor removal, sediment filtration
• Compatibility: most standard whole-home filter housings

What's in the Box

• 2 × CTO Activated Carbon Block Replacement Cartridges (4.5" × 20")

When to Replace

Replace every 3–6 months depending on local water quality and household consumption. For best results, monitor your water taste and replace at the first sign of reduced filtration performance.

Ideal for whole-home water filtration systems, protecting your family from chlorine and contaminants at every tap.