20" BB Carbon Block

The AMPAC USA 20" BB Carbon Block (CB-520-BB) is a jumbo activated carbon block cartridge built for Big Blue 4.5" x 20" filter housings, designed to reduce chlorine, chloramines, unpleasant tastes and odors, and volatile organic compounds (VOCs) from residential and commercial water supplies.

• Reduces chlorine and chloramines
• Removes unpleasant tastes and odors
• Reduces volatile organic compounds (VOCs)
• Compressed carbon block matrix for uniform flow and no channeling
• Fits standard Big Blue 4.5" x 20" filter housings

Unlike loose granular activated carbon cartridges, the CB-520-BB uses a compressed carbon block matrix that forces water through a uniform flow path, maximizing contact time with the activated carbon media. That consistent structure prevents channeling - the common failure mode in granular filters where water bypasses the media - so every gallon that passes through gets thorough, consistent treatment.

In residential whole-house systems, it delivers better-tasting drinking water, clearer water for cooking, and chlorine-free showering and bathing at every fixture. Commercial operations like restaurants, hotels, and schools use it as a cost-effective, high-capacity option for general water quality improvement or as a pre-filtration stage in larger purification systems.

The CB-520-BB is built from premium activated carbon media with precision engineering behind the compressed block construction, giving it the performance and durability AMPAC USA products are known for.