5 Micron 2.5in x 10in CTO Carbon Block Water Filter Cartridge - 6-Pack

In this review the Membrane Solutions 5 micron CTO carbon block cartridge is evaluated for homeowners and RV users who need a straightforward replacement for standard 10in housings. The bottom line: it is a practical, value-minded option for removing sediment and chlorine taste from municipal or well-treated water. The pack of six and the universal 5 micron 2.5in x 10in size make it especially useful for families, renters, or anyone maintaining several filtration points without wanting to spend on premium branded cartridges.

Key Features

• Universal size: The standard 5 micron 10in x 2.5in format fits most reverse osmosis, under-sink, countertop and whole house housings that accept 10in cartridges.
• Premium material: Constructed from coconut shell activated carbon refined through controlled production, it is designed to meet NSF/ANSI 42 materials requirements for drinking water applications.
• Efficient adsorption: The CTO carbon block has strong adsorption capacity to reduce chlorine, odors and improve overall water taste for drinking and cooking.
• Particulate reduction: The 5 micron rating captures sediment, rust, silt and sand, helping protect downstream appliances like refrigerators and coffee makers.
• Long life span: Rated for up to 15,000 gallons, the cartridge can last multiple months depending on local water quality, reducing replacement frequency.
• Easy to replace: The cartridge is simple to install by hand, and the 6-pack keeps spare filters on hand for routine 3 to 6 month changes.

Who It's For

This cartridge is best for homeowners, renters, and RV owners looking for a cost-effective replacement that fits common 10in housings and improves tap water taste by reducing chlorine and odors. It also suits anyone running multiple filter points who prefers buying replacements in bulk to avoid frequent ordering.

It is not the ideal choice for applications that require chemical removal beyond chlorine or certified reduction claims for specific contaminants beyond NSF/ANSI 42 materials compliance. Users needing ultra-high flow rates or specialty contaminant reduction should consider stage-specific membranes or media designed for those tasks.

Pros & Cons

Pros

• Good fit and compatibility with standard 10in housings, making swaps quick and predictable.
• Made from coconut shell activated carbon and materials tested to NSF/ANSI 42 requirements for material safety.
• Bulk 6-pack offers strong value and keeps replacements on hand for regular maintenance.
• Effective at reducing chlorine, odors and particulates to improve taste and protect appliances.

Cons

• Some users report mixed impressions of taste, indicating performance can vary with source water quality.
• Not intended as a specialized contaminant removal cartridge; limits are typical for CTO carbon block filters.

Specifications

Filter type	CTO carbon block
Micron rating	5 micron
Size	10in x 2.5in
Material	Coconut shell activated carbon
Certification	Tested to NSF/ANSI 42 materials requirements
Estimated life	Up to 15,000 gallons (replace every 3-6 months depending on water)
Pack quantity	6 cartridges

Our Verdict

The Membrane Solutions 5 micron CTO carbon block is a sensible, economical choice for those who need reliable chlorine and particulate reduction in a standard 10in housing. With coconut shell carbon, NSF-tested materials, and a 6-pack that lowers per-filter cost, it delivers solid value for everyday municipal and tap water treatment, though users with unusual taste concerns or special contaminant needs should compare specialty cartridges first.

Frequently Asked Questions

Will this fit my under-sink or RO system?
It fits standard 10in x 2.5in housings used in most reverse osmosis, under-sink and countertop systems, but confirm your housing accepts 10in cartridges.

How long does each cartridge last?
The cartridge is rated up to 15,000 gallons; typical replacement is every 3-6 months depending on water quality and usage.

What does it reduce?
It reduces sediment, rust and particulates and helps lower chlorine and odors to improve taste; it meets NSF/ANSI 42 materials requirements.