Whole House Water Filter Replacement Pack 4.5 x 20 - Reduces PFAS

In this review of the whole house replacement pack, the bottom line is simple: this kit is for homeowners who want broad chemical reduction and sediment protection without changing water hardness. The reviewer found it best for municipal or well water users concerned about chlorine, chloramine, heavy metals and emerging contaminants such as PFAS, because the compound stage targets a wide range of chemicals while a polypropylene sediment stage catches coarse particles down to 5 microns. Installation is straightforward for anyone familiar with 20 x 4.5 housings and the pack preserves beneficial minerals since it is not an RO membrane.

Key Features

• Two-stage filtration: The first polypropylene sediment cartridge captures particles as small as 5 microns to protect downstream equipment and improve clarity.
• Compound contaminant removal: The second FG25B-KS compound filter reduces chlorine, chloramine, hydrogen sulfide, heavy metals, lead and mercury to noticeably improve taste and odor.
• PFAS and chemical control: The compound stage is designed to diminish PFAS and common herbicide traces that municipal and some well waters may contain.
• High flow capacity: These cartridges are rated to support up to 15 GPM with minimal pressure loss, making them suitable for whole house use without sacrificing flow.
• Standard fit: Designed for housings that accept 20 x 4.5 cartridges, the pack fits popular housings for easy replacement.
• Individual packaging: Each cartridge arrives individually wrapped to preserve freshness and should be unwrapped before installation.

Who It's For

Homeowners with whole house filtration systems that accept 20 x 4.5 cartridges who want to reduce chlorine, chloramine, hydrogen sulfide, heavy metals and PFAS will see the most benefit. It is especially useful for families wanting improved water taste and odor across all taps and for those protecting appliances and plumbing from sediment.

Those seeking a reduction in Total Dissolved Solids (TDS) or looking to remove dissolved mineral hardness should look elsewhere, such as a reverse osmosis or dedicated water softening solution, because this pack preserves minerals rather than lowering TDS.

Pros & Cons

Pros

• Broad contaminant reduction improves taste, odor and removes many chemical contaminants.
• High flow performance keeps household water demand satisfied up to the rated flow.
• Fits standard 20 x 4.5 housings for straightforward replacement with minimal plumbing changes.
• Individually wrapped cartridges help ensure freshness and easy handling during install.

Cons

• Filters do not reduce TDS, so they are not a substitute for RO systems when mineral removal is required.
• Some customers reported mixed durability and occasional rust-like debris, so pre-flush after installation and inspection are advisable.

Specifications

Cartridge sizes	4.5 in x 20 in
Stages	2-stage pack (sediment + compound)
Sediment rating	5 micron
Maximum flow rate	Up to 15 GPM
Contaminants reduced	Chlorine, chloramine, PFAS, heavy metals, hydrogen sulfide, herbicides, odors
Housing compatibility	Standard housings for 20 x 4.5 cartridges
Packaging	Individually wrapped cartridges

Our Verdict

For homeowners who need whole house chemical and sediment control without removing beneficial minerals, this replacement pack delivers solid contaminant reduction and maintains household flow. It represents good value for families who prioritize taste, odor and multi-contaminant reduction, though anyone needing TDS reduction should pair it with or choose an RO system instead.

Frequently Asked Questions

Will these cartridges lower water hardness?
The pack does not reduce TDS or soften water; it preserves minerals and focuses on chemical and particulate removal.

Do the filters fit my existing whole house housing?
They are designed to fit standard housings that accept 20 x 4.5 in cartridges, including many popular brand housings.

How long will the filters last?
Life depends on water quality and usage, but the filters are intended to provide a family of four with service for up to about a year under typical conditions.