What Is 4-Stage Shower Filtration? – FiltraZen ClearFlow
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What Is 4-Stage Shower Filtration?
Inside ClearFlow: four named stages, each with a specific role.
The number of stages matters less than what each stage actually does. ClearFlow uses four named media stages so you can understand the job of each layer.
The current ClearFlow cartridge uses four stages: a sediment shell, Activated Carbon Fibre (ACF), calcium sulfite and KDF-55 redox media. Together they are designed to reduce free chlorine, capture sediment and support broader filtration performance while maintaining shower flow.
Why use more than one stage?
Shower water can contain different things you may want to address: free chlorine from disinfection, sediment from the distribution network or household plumbing, odour-causing compounds and some dissolved metals. Different media are better suited to different jobs, so a layered cartridge lets each stage focus on its function.
The four stages inside ClearFlow
Sediment shell
Captures visible and suspended particulate matter such as dirt, grit and rust. The transparent housing makes this stage visible.
Activated Carbon Fibre (ACF)
A high-surface-area adsorption stage used for chlorine, odours and organic compounds that can contribute to a pool-like smell.
Calcium sulfite
A fast-reacting water-treatment medium used for free-chlorine reduction, including in warm shower water.
KDF-55 redox media
A copper-zinc medium that supports chlorine reduction and helps reduce some water-soluble metals through redox chemistry.
What is Activated Carbon Fibre (ACF)?
Activated Carbon Fibre provides a high surface area for adsorption. In ClearFlow it is used as a chlorine- and odour-reduction stage and complements the chemically reactive media that follow it.
What is calcium sulfite in a shower filter?
Calcium sulfite is commonly used in shower filtration because it reacts rapidly with free chlorine and remains useful under warm-water conditions. In ClearFlow, it is one of the dedicated free-chlorine-reduction media.
What is KDF-55?
KDF-55 is a high-purity copper-zinc water-treatment media. It works through oxidation-reduction (redox) chemistry and is commonly used as part of multi-media filtration systems. In ClearFlow, it supports chlorine reduction and helps reduce some water-soluble metals.
Why combine different media?
Each medium behaves differently. The sediment shell handles particles, ACF provides adsorption, calcium sulfite reacts rapidly with free chlorine in warm water, and KDF-55 adds redox treatment. The laboratory performance claim belongs to the complete system rather than to one ingredient in isolation.
Are more stages always better?
No. A higher stage count is not automatically better. What matters is whether the media are identified, whether each stage has a credible job, how the complete cartridge is engineered, and whether performance claims are supported by testing.
Frequently asked questions
What is KDF-55 made of?
KDF-55 is a high-purity copper-zinc water-treatment media.
Does calcium sulfite reduce chlorine?
Calcium sulfite is commonly used to reduce free chlorine in shower filtration, particularly where water is warm and contact time is short.
Does each stage achieve 98% on its own?
No. The up to 98% result belongs to the complete ClearFlow filtration system under specified laboratory test conditions.
Does 4-stage filtration soften water?
No. ClearFlow is not designed to remove hardness minerals such as calcium and magnesium, so it is not a water softener.
More from the ClearFlow Knowledge Series
Testing & performance disclaimer. ClearFlow has been evaluated through laboratory testing under controlled conditions. Reported performance figures may vary with water quality, chlorine concentration, temperature, pressure, flow rate, cartridge age and other factors. The up to 98% free-chlorine reduction figure represents a maximum laboratory result under the specified test conditions and is not a guarantee of the same reduction in every household or water supply.
ClearFlow is designed to reduce free chlorine and capture sediment and particulate matter. It is not a water softener and is not designed to remove hardness minerals such as calcium and magnesium. Chloramine performance may differ from free-chlorine performance.
Ready to see ClearFlow in your shower?
Current launch price: $99 (was $129). The live FiltraZen site currently offers free Australia-wide shipping during the launch promotion.
Written by Filtrazen Editorial Team
