IF-4103 Replacement GAC Inline Post Filter

Name: IF-4103 Replacement GAC Inline Post Filter
Brand: Vertex
SKU: IF-4103
Price: 8.25 USD
Availability: InStock

for Vertex/RO system setups

$8.25

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About this product

Fresh taste, simple swap

The IF-4103 is a granular activated carbon (GAC) inline post filter that improves taste, removes residual odors, and polishes water after RO or carbon systems. Its compact 2" × 10" inline design and 1/4" FPT ports allow easy installation in tight spaces.

A coconut-shell carbon blend provides clean, fresh-tasting water for residential and light commercial applications.

Restores clean taste & odor with coconut‑shell GAC polishing.
Fits 2″×10″ inline housings with 1/4″ FPT ends (threaded).
Annual replacement post filter for Vertex/RO setups.
IsoTwist installations that were built with an inline post filter, and Vertex PureWaterMachine / GreenMachine RO systems that specify IF‑4103

Best for

Reverse osmosis (RO) systems needing a final polishing filter
Under-sink drinking water systems
Ice makers, refrigerators, beverage dispensers
Offices, break rooms, small food-service stations
Any application requiring inline taste & odor reduction

Specifications

Model	IF-4103
Filter Type	Granular Activated Carbon (GAC), Coconut Shell
Configuration	Inline Post Filter
Size	2" × 10"
Port Size / Type	1/4" Female Pipe Thread (FPT)
Micron Rating	GAC (nominal, not rated by micron)
Service Life	Typically 6–12 months, depending on water quality & usage

Certifications

WQA Gold Seal Certified for material safety and structural integrity

What's in the box

IF-4103 GAC Inline Post Filter
Pre-installed 1/4" FPT ports

Installation tips

Install after RO membrane or carbon block as a polishing filter.
Mount horizontally or vertically, ensuring flow direction matches the arrow on the housing.
Flush filter for 3–5 minutes (or until water runs clear) before use.
Use Teflon tape on threaded fittings to prevent leaks.
Replace every 6–12 months or as taste/odor returns.
Protect from freezing or excessive heat.

Frequently asked questions

Will this fit my IsoTwist?
Yes, if your IsoTwist uses a separate inline post filter with threaded ends. If you see 1/4‑turn twist‑off cylinders mounted on a head, you need TF‑4114 (GAC) instead.

What does a GAC post filter do?
It’s a taste & odor “polishing” stage after RO, great for removing residual chlorine taste or tank taste before the faucet.

How often should I replace it?
Annually, the Vertex recommendation is for the post‑filter stage. High usage or poor feed water may require sooner.

Do you carry a quick‑connect version? Yes, order IFA‑4103 (same size, with QC fittings built in).