SimPure 20in x 4.5in Carbon and KDF Whole House Filter - Replacement

In this review the SimPure 20in x 4.5in Carbon and KDF replacement cartridges are evaluated for whole house and heavy-use point-of-entry systems. The bottom line: these cartridges are best for households wanting improved taste and reduced chlorine and metal ions without complicated installs. The reviewer found the blend of coconut shell activated carbon and copper-zinc KDF media provided noticeably better odor and chlorine reduction, and that the universal 20in big blue size makes them an easy swap for many housings.

Key Features

• High-Quality KDF: KDF media uses redox reactions to convert harmful substances and reduce residual chlorine, improving water taste and odor.
• GAC and KDF Blend: The combination of coconut shell activated carbon and copper-zinc alloys targets iron, lead, mercury, chlorine, and odors for broader contaminant reduction.
• Universal Fit: Designed as a 20in big blue replacement, it fits SimPure DB20P housings and many common 4.5in whole house filter housings for easy swapping.
• Recommended Replacement Interval: The suggested 6-12 month replacement window helps maintain performance while matching typical household usage patterns.
• Pressure and Temperature Tolerances: Best performance between 25-90 psi and 41-100F, which suits most residential plumbing conditions.

Who It's For

The SimPure 20in KDF/GAC cartridges are ideal for homeowners on municipal or well systems who want a straightforward replacement that cuts chlorine taste and odor and reduces certain metals in their whole house line. Installers who prefer a universal 20in big blue size will appreciate the compatibility with many housings and the rubber washers that help seal connections.

Those who need particulate-only filtration or filters rated for microbiological contaminants should look elsewhere, and users requiring replaceable media cartridges should note these units are not designed for media replacement and are intended as complete cartridge swaps.

Pros & Cons

Pros

• Effective at reducing chlorine smell and improving tap water taste due to the KDF and coconut shell carbon blend.
• Universal 20in fit works with many whole house filter housings, simplifying replacement.
• Reasonable lifespan guidance of 6-12 months, giving predictable maintenance intervals.

Cons

• Some customers report mixed fit and durability experiences, so double-check housing compatibility before purchase.
• The filter is not fully filled by design, which is important for performance but may seem unusual to some users.

Specifications

Our Verdict

The SimPure 20in carbon and KDF replacement cartridges are a practical, value-oriented choice for homeowners who want reliable chlorine and metal ion reduction in a universal 20in format. They deliver noticeable taste and odor improvements and are easy to install in compatible housings, making them a sensible pick for whole house pre-filtration or point-of-entry systems where chemical reduction is the priority.

Frequently Asked Questions

Will this fit my standard big blue housing?
It is designed for 20in x 4.5in big blue housings and lists compatibility with many common models, but always measure and compare end cap dimensions before buying.

How often should I replace the cartridge?
SimPure recommends replacing the cartridge every 6-12 months depending on water quality and usage to maintain optimal performance.

Can the media be refilled or replaced?
No, the cartridge is not designed for media replacement; it is intended to be replaced as a complete unit.