SimPure GAC Filter 20 x 4.5 in Whole House Carbon Filter - Reliable

In this review the SimPure GAC Filter 20 x 4.5 in is assessed as a straightforward, budget-friendly replacement carbon cartridge for whole house and under-sink systems. The bottom line: it is best for households that need effective chlorine, taste and odor reduction without complex installation. The review found the filter's coconut shell granular activated carbon media delivers noticeable improvement in tap water taste and smell, and compatibility with many 20 in housings makes swaps easy for users who want a practical, high-flow solution.

Key Features

• Premium material: Coconut shell activated granular carbon adsorbs chlorine and many taste and odor compounds, improving water quality for drinking and cooking.
• High flow rate: A large filtration area supports up to 15 GPM, which is adequate for whole house needs and maintains good water pressure for multiple fixtures.
• Long service life: The cartridge is rated to filter up to 40,000 gallons and is intended to be replaced every 6-12 months depending on water quality.
• Wide compatibility: Sized at 20 x 4.5 in to fit most standard blue or clear big housings and specific SimPure models, simplifying replacement in many systems.
• Versatile use: Suitable for both well water and city water scenarios, so it can be used in homes, farms, offices and restaurants to reduce odors and chlorine.

Who It's For

The SimPure GAC Filter is ideal for homeowners who need a reliable replacement cartridge that focuses on chlorine, taste and odor reduction and who already use or can accommodate a standard 20 x 4.5 in filter housing. It suits families and small businesses that want a simple swap-in solution with a high flow capacity to serve multiple fixtures.

Those who need multi-stage contaminant removal beyond chlorine and taste - for example heavy sediment, iron, or microbiological protection - should pair this GAC element with a dedicated sediment or specialty media stage or consider a different multi-media system. Users who require certified performance for very specific contaminants should verify suitability before purchase.

Pros & Cons

Pros

• Effective at reducing chlorine taste and odors, improving water flavor for drinking and cooking.
• High flow up to 15 GPM supports whole house demand without noticeable pressure loss in typical setups.
• Compatible with many standard 20 in housings, making replacements quick and inexpensive.
• Long rated life up to 40,000 gallons provides good value when water quality is moderate.

Cons

• Fit can be mixed depending on housing tolerances; a few users report it may be fractionally long or require careful seating.
• Does not remove all classes of contaminants on its own and works best paired with sediment pre-filtration for optimum service life.

Specifications

Filter size	20 x 4.5 in
Filter media	Coconut shell granular activated carbon
Flow rate	Up to 15 GPM
Maximum pressure	80 psi
Maximum temperature	104F (40C)
Rated life	Up to 40,000 gallons; replace every 6-12 months

Our Verdict

The SimPure GAC Filter 20 x 4.5 in is a practical, cost-effective carbon replacement for users who prioritize chlorine and odor removal and need a high-flow cartridge for whole house service. It offers good value and broad compatibility, but perform a quick fit check and use a sediment pre-filter in systems with particulate load to get the best lifespan and performance.

Frequently Asked Questions

Will this filter fit my existing 20 in housing?
It is designed for standard 20 x 4.5 in housings and many common models, but check housing internal length and seat style since a small number of users report tight fits.

How often should the cartridge be replaced?
Replace approximately every 6-12 months depending on water quality; the cartridge is rated to treat up to 40,000 gallons under typical conditions.

What contaminants does the GAC element remove?
The granular activated carbon primarily adsorbs chlorine, tastes and odors and some organic compounds; pair with sediment filtration for particulate and to protect the carbon element.