CTO Max Single Undersink Water Filter
  • CTO Max Single Undersink Water Filter
  • CTO Max Cartridge

CTO Max Single Under Sink Water Filter

(4 customer reviews)

$239.00 – $259.00 inc. GST

Many homes still rely on untreated tap water containing chlorine, microplastics, PFAS, and heavy metals, which is why an Undersink Water Filter is essential for clean, safe water straight from your tap.

  • Reduces up to 99.9% of chlorine and other common contaminants.
  • UK-Made Cartridge that targets chlorine, chloramine, PFAS, microplastics and organic compounds.
  • NSF / ANSI 53 & NSF/ANSI 42 certified cartridges made by Coldstream (UK).
  • Built by Hand in Sydney: hand-assembled and backed by a 5-year housing warranty.
  • DIY-Friendly Setup: Comes with clear instructions and only basic tools required. WaterMark certified and fully compliant with AS/NZS 3497:1998.
NSF Watermark certified
NSF Watermark certified

Choose the tap for your under sink water filter

Retro with High Loop Metro with High Loop Chrome +$20.00 Antique with High Loop +$20.00 Euro with Long Reach +$90.00 Side Lever High Loop 3 Way Mixer Chrome +$409.00 Side Lever Long Reach 3 Way Mixer Chrome +$349.00 3-Way Mixer Tap Standard Chrome +$319.00 Stainless Steel 3 Way High Loop Matte Black Mixer Tap +$449.00
SKU: IT007193-CTO Category:

Description

Wondering What’s in Your Glass — or Knowing It’s Pure

What Happens If You Don’t Filter Your Water?

  • You’ll keep second-guessing every glass, and every meal you cook, wondering what’s really in your water.
  • Cumulative exposure adds up as even low levels of contaminants like
    PFAS can build up in the body.

What Happens If You Do?

  • Feel confident, knowing that every glass of water is clean, clear, and free from what doesn’t belong.
  • No more guesswork, just everyday peace of mind, the way it should be.
  • Support your wellbeing from drinking to cooking and brushing your teeth.
  • Choose clean living at the source.

We've Been There Too

We know what it feels like to struggle with finding the right water filter system — the overwhelm, the conflicting information, the worry of getting it wrong. We’ve been there too, and remember how frustrating it was trying to make the best choice for our family’s wellbeing. That’s why we built a business around helping others make sense of it all. Since then, we’ve helped thousands of households find a water filter they can trust.

Everything You Want to Know (At a Glance)

Quick Answers

How often do I need to change the cartridge and how much does it cost?
The Coldstream CTO Max should be replaced every 6-12 months depending on water quality and usage. The replacement cartridge costs $120. 

Can I install this under sink filter myself?
Yes, you can install this undersink water filter yourself if you have basic plumbing skills. It’s WaterMark approved, meaning it meets Australian plumbing standards. If you prefer, a licensed plumber can install it for you as well.

What contaminants does it remove?
This under sink water purifier removes over 130 chemicals incl. chlorine, chloramine, herbicides & pesticides, bacteria, virus, PFAS, microplastics, heavy metals.

How do I replace the cartridge?
Simply twist open the housing, remove the old cartridge, insert the new one, and twist the housing closed. No special tools required – it’s quick and easy! 

  • Filter output up to 10,000 litres, for optimal performance we recommend replacing the filters every 6-12 months
  • 0.9 Micron absolute
  • Dimensions: 12 (W) x 32 (H) x 13(D)
  • Cartridge sizes: 9″ x 2.5″ (blue caps), 10″ x 2.5″ (red caps)
  • Maximum flow rate: 2.5 litres per minute
  • Warranty: 5 years (housing)
CTO MAX Filter Cartridge

Coldstream CTO Max Replacement Cartridge

The system requires the cartridge to be replaced every 6-12 months for optimal performance.

You want clean, safe water for your family—and the Coldstream CTO Max helps you get there. This all-in-one cartridge removes over 130 contaminants, including Chlorine, Chloramine, PFAS, heavy metals, bacteria, and viruses. With its advanced dual-layer design, it fits standard benchtop water filter & undersink water filters and delivers peace of mind with every glass. Certified to NSF standards and made in the UK, it’s your powerful ally in creating a healthier home through pure, great-tasting water.

Installation of your single 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! 

Single Undersink Installation Instructions
Doulton Single Under Sink water filter Ultracarb diagram
Doulton Single Under Sink water filter Ultracarb component diagram

CTO Max Single Under Sink Water Filter Components

  • A – CTO Max Filter Cartridge
  • 1 – Housing Sump
  • 2 – Housing Cap
  • 3 – Stainless Steel Bracket
  • 4 – Pressure Limiting Valve (PLV)
  • 5 – John Guest Elbow (with red clips)

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.

ADD TO CART

Clean Water Shouldn’t Be Complicated — Just Clear, Safe, and Ready

At Living Whole, we know you are the kind of person who wants to feel confident and at ease about what’s going into your body. In order to be that way, you need clean, trusted water flowing from your tap — no second-guessing, no stress.

The problem is that tap water is often full of chemicals like chlorine, PFAS, and heavy metals, which makes you feel frustrated, overwhelmed, and worried about your family’s wellbeing.

We believe no one should need a science degree just to drink safe water at home.

Here’s how it works:

  1. Choose the CTO Max Undersink Water Filter.
  2. We assemble your under sink filter for you and send it with everything you need.
  3. Install it easily and enjoy pure, safe water every day for years to come.

Order your CTO Max undersink water filter system today, so you can stop wasting time researching or relying on bottled water and start drinking with clarity, confidence, and peace of mind.

Certified Countertop Water Filtration

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

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

Choose Your Under Sink Water Filter Tap

All our under sink water filter taps feature a chrome finish and 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

View Details
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

View Details
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

View Details
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

View Details
ADD TO CART

Installation Guides

Single Undersink Installation Guide
Drinking Water Faucet Installation Guide

Data Sheets & Test Reports

CTO Max Test Results

Additional information

Weight2 kg
Dimensions16 × 13 × 32 cm
Size

9 Inch, 10 Inch

4 reviews for CTO Max Single Under Sink Water Filter

  1. Harry P –

    Easy to install, excellent service and great product so far. If drinking water is a priority for you and family. I recommend this under bench system for its taste and affordability.

    Having one internal filter that does three jobs is Perfect and the taste wether warm or cold is exactly what I wanted.

    • Living Whole –

      Thanks for your great feedback, Harry!😊 We’re glad you’re enjoying the taste and convenience of your system. Just a tip—it’s best to use cold water with the filter for optimal performance.

  2. Katherine Hayward –

    Love this product. It arrived in good time. It was very easy to install – thank you to my son.
    The under sink filter system and tap fits well under the sink, is a quality product at an excellent price.
    Good flow speed on tap. It is slower than normal household tap, but no one has complained for having filtered water available.
    Loving filtered water.

    • Living Whole –

      Hi Katherine, thank you for your wonderful review! We’re happy you’re enjoying the filter system and finding it easy to use. Your satisfaction means a lot to us!

  3. Vy –

    We installed the single filter under sink Doulton system last week. The family loves it!
    Extremely impressed with its compactness, flow rate, and the competitive price and reliable communication of Living Whole.
    Proud to support this Aussie family business.

    • Living Whole –

      Hi Vy, thank you for your review! We’re glad your family loves the Doulton under sink water filter and we appreciate you supporting our business!

  4. Dianne –

    My order was slightly complex but the team were easily contactable and dealt with my needs with ease. Thanks – not everyone provides such helpful service these days! Delivery was timely and I was kept informed throughout. Product works as expected and easy to install!

    • Living Whole –

      Thank you for your feedback, Dianne! We’re glad everything went smoothly and that you’re happy with the service and product.🙂

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