CTO Max Twin Under Sink Water Filter with Fluoride Removal for Hard Water
Powerful filtration with added scale protection – designed for homes in hard water areas.
Feel confident about every glass you pour. Whether you’re caring for your family or simply looking after yourself, you want to feel good about the water you drink every day. But in areas like WA, NT, SA, and parts of QLD, hard water can be frustrating — leaving scale in your kettle, clogging filters, and affecting the feel of your water.
You’ve done your research. You care about what goes into your body and your home. But you’re tired of second-guessing, and you shouldn’t need a chemistry degree or a plumber to feel confident about your water.
That’s why we created the CTO Max Twin Under Sink Water Filter with Chlorine & Fluoride Removal for Hard Water, a powerful, low-maintenance solution that not only removes chlorine, fluoride, PFAS, microplastics, and other nasties but also helps reduce scale buildup from hard water. Clean, great-tasting water — plus protection for your appliances, filter system, and peace of mind.
Because clean living should be empowering — not overwhelming.
Meet the CTO Max Twin – Now with Limescale Protection
Designed for health-conscious homes in hard water regions, this compact undersink water filter system delivers reliable, high-performance filtration straight from your kitchen tap without taking up bench space.
- Dual-stage UK-made carbon block filters remove fluoride, chlorine, chloramine, PFAS, microplastics, heavy metals, and organic contaminants.
- Inline phosphate cartridge made by Omnipure in the USA helps reduce mineral scale build-up — ideal for protecting your filter and appliances in hard water areas.
- Certified to NSF/ANSI 53 & 42 standards for effective contaminant removal you can trust.
- Hand-built in Sydney and backed by a 5-year housing warranty. Fully compliant with AS/NZS 3497:1998.
- DIY-friendly setup — install it yourself or get a plumber to do it for you. It’s simple either way.
Because your water filter should work with your water — not against it.
3 Simple Steps to Safer Water
1. Choose Your Filter – Order the CTO Max Twin for Hard Water and join our Water Tribe.
2. We Build & Send – Each unit is assembled with care in Sydney and shipped with tracking.
3. Install & Enjoy – Fit it yourself or have it installed. Enjoy clean, great-tasting water on tap.
What You’re Avoiding
✘ Limescale in your kettle, water filter, and on your tapware
✘ Health worries about PFAS, chlorine, or fluoride
✘ Kitchen clutter and bottled water dependency
✘ Endless research and filter confusion
What You’ll Gain
✓ Cleaner, better-tasting water — every time
✓ Protection against scale build-up in hard water areas
✓ Confidence in your health choices
✓ A more sustainable, clutter-free kitchen
✓ A home that supports your values and wellbeing
You’re not just filtering water. You’re creating a home that feels safe, intentional, and aligned with how you live.
Take Control of Your Water
Order the CTO Max Twin Under Sink Water Filter – Chlorine & Fluoride Removal for Hard Water today and enjoy fresh, filtered water that works for your body and your home.
$539.00 inc. GST
Description
Specifications
- Filter output up to 10,000 litres, for optimal performance we recommend replacing the filters every 6-12 months
- 0.9 Micron absolute
- Dimensions: 23(W) x 45 (H) x 13(D)
- Cartridge sizes: 9″ x 2.5″Â
- Maximum flow rate: 2.5 litres per minute
- Warranty: 5 years (housing)
Filter Cartridges
The system requires 2 of these cartridges 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 Fluoride, 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 built in the UK, it’s your powerful ally in creating a healthier home through pure, great-tasting water.
Say goodbye to hard water hassles with the Omnipure K5485-BB phosphate inline cartridge. Designed to reduce limescale and mineral buildup, this 5-micron filter protects your reverse osmosis membrane and extends the life of your system. Perfect for hard water areas, it fits compactly in line before your filtration cartridge, preventing scale damage to your appliances. Made in the USA by trusted Omnipure, the K5485 offers reliable pre-treatment with easy installation. Designed to last up to 6 months or 5,700 litres, it keeps your water flowing smoothly and your system protected.
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.Â
We want to ensure your installation experience is easy and stress-free. Please reach out to our support team with any questions!Â
Installation Diagram
Filter Componants
- A – CTO Max Cartridge
- B – 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
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.
- Aluminium
- Barium
- Cadmium
- Chloramine
- Chlorine
- Chromium
- Copper
- Cryptosporidium & Giardia
- Cysts
- e. Coli Bacteria
- Fluoride
- Heavy Metals
- Hydrocarbons
- Iron
- Lead
- Manganese
- Mercury
- Microplastic
- Nitrate
- PCB’S
- PFAS
- Potassium
- Radium
- Sediment, Dirt & Rust
- Selenium
- Sodium
- Aluminium
- Barium
- Cadmium
- Chloramine
- Chlorine
- Chromium
- Copper
- Cryptosporidium & Giardia
- Cysts
- e. Coli Bacteria
- Fluoride
- Heavy Metals
- Hydrocarbons
- Iron
- Lead
- Manganese
- Mercury
- Microplastic
- Nitrate
- PCB’S
- PFAS
- Potassium
- Radium
- Sediment, Dirt & Rust
- Selenium
- Sodium
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.
Spring Loaded with Long Reach
Standard Spring Loaded faucet with black lever, in a long reach design.
200mm W x 210mm H
Mode
Standard Mode faucet in a high loop design.
150mm W x 290mm H
Retro
Standard Retro faucet in a high loop design and long reach.
125mm W x 235mm H
Euro with Long Reach
Standard Euro faucet in a long reach design.
150mm W x 230mm H
Euro with High Loop
Standard Euro faucet in a high loop design.
150mm W x 230mm H
Metro
Standard Metro faucet in a high loop design.
160mm W x 250mm H
Antique
Standard Antique faucet in a high loop design.
125mm W x 235mm H
Fin
Standard Fin faucet in a long reach design.
135mm W x 250mm H
Data Sheets & Test Reports
Additional information
| Weight | 2.5 kg |
|---|---|
| Dimensions | 36 × 36 × 15 cm |
| Alkaliser | AlkaHydrate (made in Asia), Omnipure (Made in USA) |
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