Tier1 20 Micron 10 x 4.5 Water Filter | Carbon Block - Upflow Granular Activated Whole House Cartridge | Replacement for Pentek GAC-BB, 155153-43 | 4.5 x 10 Water Filter

Q. What is this filter used for?A. This whole house carbon cartridge is designed to help reduce chlorine taste and odor in municipal water systems before water reaches plumbing fixtures and appliances. Q. What does 20 micron mean in this filter?A. The 20 micron outer layer helps screen larger sediment before water flows through the granular activated carbon media inside the cartridge. Q. How does upflow granular activated carbon work?A. In an upflow design, water enters from the bottom and moves upward through the carbon bed. This flow path supports extended contact between water and carbon media. Q. Where is this filter typically installed?A. This 10 x 4.5 inch cartridge is typically installed in standard whole house housings at the point of entry, often located in basements, garages, or utility areas. Q. Is this suitable for well water?A. This cartridge is primarily designed for municipal water applications where chlorine taste and odor reduction is desired. Heavy sediment well water may require upstream sediment filtration. Q. Does this remove sediment?A. The outer wrap helps capture larger particulate, but this cartridge is designed primarily for chlorine taste and odor reduction rather than fine sediment control. Q. Will this reduce water pressure?A. When installed in a properly sized housing and replaced as needed, the cartridge is designed to support steady residential flow. Reduced flow may indicate the cartridge has reached capacity. Q. How do I know when to replace it?A. Replacement depends on chlorine levels and household usage. Noticeable return of chlorine taste or odor, or reduced flow, are common indicators.

• COMPATIBLE REPLACEMENT MODELS – This 20 micron 10 x 4.5 granular activated carbon cartridge replaces Pentair GAC-BB, 155153-43 and fits most standard 4.5” x 10” whole house filter housings.
• UPFLOW GAC FILTRATION DESIGN – Upflow configuration helps maximize contact time between water and carbon media, supporting chlorine taste and odor reduction throughout the home.
• 20 MICRON SEDIMENT SCREENING – Integrated outer wrap helps capture larger particulate before water enters the carbon bed, supporting balanced performance in municipal water systems.
• DESIGNED FOR WHOLE HOUSE TASTE & ODOR CONTROL – Commonly installed at the point of entry to address chlorine-related taste and odor concerns affecting showers, sinks, and appliances.
• SERVICE LIFE DEPENDS ON WATER USAGE – Replacement timing varies based on chlorine levels and water consumption. Monitoring taste changes or flow reduction helps determine proper cartridge replacement.