CTO Max Twin Under Sink Water Filter – Maximum Fluoride Shield

Clean water shouldn’t be complicated. This Twin Undersink Water Filter uses two cartridges working together to reduce fluoride and common contaminants.

  • US-made Omnipure Fluoride Filter – reduces fluoride by up to 97%
  • UK-made CTO Max ceramic & carbon block filter – works alongside the Omnipure filter to reduce fluoride by up to 88.9%, plus chlorine, chloramine, PFAS, microplastics, heavy metals and bacteria
  • Certified to NSF/ANSI 53NSF/ANSI 42 standards.
  • Hand-built in Sydney, backed by a 5-year housing warranty, and fully compliant with Watermark standard AS/NZS 3497:1998.
  • DIY-friendly setup – install this under sink filter with basic tools, or have a plumber do it for you. It’s simple either way.
  • Replace filters every 6 months or 10,000 litres.

NSF Watermark certified

Price range: $449.00 through $469.00 inc GST

Choose Your Filter Options

Dedicated Filtered Water Tap

The default system includes a dedicated filtered water tap (Retro High Loop). If you decide to upgrade to a 3 way mixer below the dedicated filtered water is no longer required.

Retro High Loop Metro with High Loop +$30.00 High Loop Stainless Steel Brushed Finish +$45.00 Euro with Long Reach +$60.00 Retro High Loop
(Optional) 3 Way Mixer Upgrade

Choose a 3 way mixer to replace your existing kitchen mixer tap. Choosing one of these options means you won’t need to drill a hole in your benchtop or sink to install a tap. You’ll simply be replacing your existing kitchen tap (providing it’s a mixer tap).

None Premier Stainless Steel Tall 3-Way Mixer Long Reach +$320.00 Side Lever High Loop 3-Way Mixer Tap Chrome +$429.00 Premier Stainless Steel Standard Matte Black 3-Way Mixer Tap Long Reach +$420.00 Stainless Steel 3 Way High Loop Matte Black Mixer Tap +$420.00

Specifications

  • Filter life Omnipure Fluoride: 6 months or 1,892 litres
  • Filter life CTO Max: 6 months, or 10,000 litres
  • 0.9 Micron absolute
  • Maximum flow rate: 2.5 litres per minute
  • Warranty: 5 years (housing)
  • Temperature Range: 5°C – 38°C
  • Dimensions: 23cm(W) x 34cm (H) x 13cm(D)
  • Cartridge sizes: 9″ x 2.5″ (blue caps), 10″ x 2.5″ (red caps)

Note for customers in WA and SA: Due to higher sediment levels in some water supplies, standard filters may clog faster. We highly recommend the
CTO Max Twin Under Sink Water Filter – Sediment & Fluoride Shield to ensure consistent flow rates in your region.

Certified Under Sink Water Filtration

This system meets the WaterMark specification AS/NZS 3497:1998 Amdt 1 2001 Drinking water treatment unit – Plumbing requirements.
Certificate Number 23124.

  • Fluoride
  • Aluminium
  • Barium
  • Cadmium
  • Chloramine
  • Chlorine
  • Chromium
  • Copper
  • Cryptosporidium & Giardia
  • Cysts
  • e. Coli Bacteria
  • Heavy Metals
  • Hydrocarbons
  • Iron
  • Lead
  • Manganese
  • Mercury
  • Microplastics
  • PCB’S
  • PFAS
  • Potassium
  • Radium
  • Sediment, Dirt & Rust
  • Selenium
  • Sodium
  • Fluoride
  • Aluminium
  • Barium
  • Cadmium
  • Chloramine
  • Chlorine
  • Chromium
  • Copper
  • Cryptosporidium & Giardia
  • Cysts
  • e. Coli Bacteria
  • Heavy Metals
  • Hydrocarbons
  • Iron
  • Lead
  • Manganese
  • Mercury
  • Microplastics
  • PCB’S
  • PFAS
  • Potassium
  • Radium
  • Sediment, Dirt & Rust
  • Selenium
  • Sodium

WaterMark Certification
NSF Certification

Everything You Want to Know

What’s included in the system?

The system comes complete with the first set of filters, housing, hoses, screws, locking clips, and all components required for installation (excluding tools).

Omnipure Fluoride Removal Cartridge XF834/XF934: Every 6 months ($95).
Coldstream CTO Max cartridge: Every 6 months ($120 – discounted twin set available).

Yes, you can install this undersink water purifier yourself if you have basic plumbing skills. It’s WaterMark approved, meaning it meets Australian plumbing standards. If you prefer, your local licensed plumber can install it for you as well.

This system removes over 130 chemicals and contaminants incl. chlorine, chloramine, fluoride, herbicides & pesticides, bacteria, virus, PFAS, microplastics, heavy metals.

Simply twist open the housing, remove the old cartridge, insert the new one, and twist the housing closed. No special tools are required — and a filter wrench is included to make the process even easier. It’s quick and straightforward.

The system comes complete with the first set of filters, housing, hoses, screws, locking clips, and all components required for installation (excluding tools).

Omnipure Fluoride Removal Cartridge XF834/XF934: Every 6 months ($95).
Coldstream CTO Max cartridge: Every 6 months ($120 – discounted twin set available).

Yes, you can install this undersink water purifier yourself if you have basic plumbing skills. It’s WaterMark approved, meaning it meets Australian plumbing standards. If you prefer, your local licensed plumber can install it for you as well.

This system removes over 130 chemicals and contaminants incl. chlorine, chloramine, fluoride, herbicides & pesticides, bacteria, virus, PFAS, microplastics, heavy metals.

Simply twist open the housing, remove the old cartridge, insert the new one, and twist the housing closed. No special tools are required — and a filter wrench is included to make the process even easier. It’s quick and straightforward.

Replacement Filter Cartridges for
CTO Max Twin Under Sink Water Filter with Maximum Fluoride Shield

1st Stage Omnipure Fluoride Replacement Cartridge

The system requires 1 of these cartridges to be replaced every 6 months or 1892 litres, dependent on water quality.


Omnipure Fluoride Filter XF834-934-II


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2nd Stage Coldstream CTO Max Replacement Cartridge

The system requires 1 of these cartridges to be replaced every 6 months or 10,000 litres,  dependent on water quality.


CTO Max Replacement Cartridge-Box


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1st Stage of Filtration: Omnipure Fluoride Cartridge

Transform your tap water with the Omnipure Fluoride Removal Cartridge, a premium solution for superior hydration. Expertly manufactured in the USA, this 5-micron filter targets and removes over 90% of fluoride, delivering crisp, contaminant-free water for drinking and cooking. Compatible with twin bench top water filter and under sink water filter, it offers long-lasting performance for up to 12 months. Rely on this NSF-certified technology to provide your household with the ultimate peace of mind. 

Tested and certified to NSF/ANSI 42

2nd Stage of Filtration: Coldstream CTO Max – Made in UK

Remove Fluoride and Chlorine with only one cartridge! The KLT Coldstream CTO MAX water filter is an All-in-One filter removing over 130 Chemicals incl. Chlorine, Chloramine, and Fluoride, along with Bacteria, Virus, PFAS, Microplastics, Heavy Metals. Suitable for our Benchtop and Undersink water filter systems, it features a unique design that utilises a two-part construction: Outer ceramic layer with antimicrobial properties and Inner carbon core for chemical contaminant protection. 

Tested and certified to NSF/ANSI 42 and NSF / ANSI 53 for Chemicals, PFAS, Microplastics.

Pure Water, Pure Peace of Mind

You’re tired of second-guessing your tap water.
Tired of the endless research rabbit hole just to avoid fluoride, PFAS, hidden toxins, heavy metals, and microplastics.

That’s exactly why this system exists:

  • No more guessing – Feel 100% confident about your water.
  • Advanced double protection with a water filter that filters fluoride and over 130 other contaminants.
  • Zero hesitation. Fill your kettle. Wash your veggies. Cook meals. Pour freely.
  • Out of sight. On your side. A compact system that works quietly in the background. 

Turn on the tap and relax. 

Twin Undersink Fluoride Water Filter in kitchenII

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3 Simple Steps to Safer Water — with Free Shipping Australia-Wide:

Join our Pure Water Tribe – Choose your custom water filter system and become part of a community that values clean, safe water.

Crafted for you in Sydney – Our team hand-builds your water filter to order and ships it with tracking, so you know its on its way.

Install your water filter simply, turn on your tap and feel at home with others who trust what they drink.

How We Got Here And Why It Matters

We’re a family business built on firsthand experience and a genuine commitment to better wellbeing through clean water. With over 40 years of combined expertise and nearly a decade in business, we’ve helped thousands of families choose the right water filter system. We offer clear, honest advice and products we truly stand behind—and use ourselves.




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Choose Your Under Sink Water Filter Tap

All our under sink water filter taps include a base plate and connection fittings.
* Please Note: the width (W) refers to the dimension from the centre line of the tap body to the centre of the spout.

Chrome Retro Faucet with High Loop and Long Reach

Retro with High Loop

Standard Retro faucet in a high loop design and long reach.

125mm W x 235mm H

Chrome Metro Faucet with High Loop

Metro with High Loop

Standard Metro faucet in a high loop design.

160mm W x 250mm H

Chrome Antique Faucet with High Loop

Antique

Standard Antique faucet in a high loop design.

125mm W x 235mm H

Chrome Euro Faucet with Long Reach

Euro with Long Reach

Standard Euro faucet in a long reach design.

150mm W x 230mm H

Side Lever High Loop Mixer IT003855

Side Lever High Loop 3-Way Mixer Chrome

The Side Lever High Loop 3-Way Mixer Tap in Chrome features a sleek high-loop design, providing hot, cold, and filtered water from a single tap.

203mm W x 365mm H


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Side Lever Mixer IT001169

Side Lever Long Reach 3-Way Mixer Chrome

The Side Lever Long Reach Mixer Tap features a simple yet elegant design, providing hot, cold, and filtered water from a single tap.

195mm W x 325mm H


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3 Way Mixer Tap STD Chrome

3-Way Mixer Tap Standard Chrome

The 3-Way Mixer Tap Standard Chrome comes in a  sleek long-reach design, providing hot, cold, and filtered water from a single tap.

245mm W x 180mm H


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Stainless Steel 3 Way High Loop Matte Black Mixer

Stainless Steel 3 Way High Loop Matte Black Mixer Tap

The Stainless Steel 3 Way Mixer Tap features a high loop design in a matte black finish, providing hot, cold and filtered water from a single tap.

225mm W x 400mm H


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Component Diagram

Doulton Twin Under Sink Water Filter Ultracarb with fluoride removal component diagram

  • A – Omnipure Fluoride Cartridge XF834/XF934
  • B – Coldstream CTO Max Cartridge
  • 1 – Housing Sump
  • 2 – Housing Cap
  • 3 – Stainless Steel Bracket
  • 4 – Pressure Limiting Valve (PLV)
  • 5 – John Guest Elbow (with red clips)
  • 6 – Brass Nipple

Hassle-Free Installation

Installation of your twin undersink water filter system is straightforward with the included guide and complete package of parts. All necessary fittings, tubing, and adapters are provided for a seamless setup. 

We want to ensure your installation experience is easy and stress-free. Please reach out to our support team with any questions! 

Doulton Twin and Triple Undersink Water Filter Installation Diagram

Designed to Be Straightforward — With Support When You Want It

You don’t need to be a plumber — Just someone who cares about their home and wellbeing. Our systems are designed for people who want to create a safe home without overcomplicating things. Everything is thoughtfully built so installation is logical and achievable. You can choose to connect the system yourself or have your local plumber handle the install. 

  • We build it. You connect it.
  • Our step-by-step guide, backed by local Australian support, means you’re never left guessing.

Choosing Living Whole means joining a community that values better water, every day.

Living Whole Standard Badge

Installation Guides


Twin Undersink Installation Instructions


Twin Undersink Maintenance Guide


Drinking Water Faucet Installation Guide


Leak Stopper Installation Guide

Data Sheets & Test Reports


Omnipure Fluoride Removal


CTO Max Test Results