Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage
Price range: $809.00 through $839.00 inc. GST
All you want is peace of mind that your family’s water is pure, in a system that’s simple, effective, and fits even the smallest spaces
- US made filters and 0.0005 micron RO membrane remove fluoride, chlorine, PFAS, bacteria, viruses, microplastics, heavy metals.
- Adds essential minerals back into the water for a balanced taste.
- Fits anywhere: true compact design saves precious undersink space (30x18x17cm + tank).
- Features NSF-certified components and is Watermark certified (AS/NZS 3497:1998).
- Hand-built in Sydney with US-made parts. Includes a 5-year housing warranty.
- Average Annual replacement cost: $207–$232, depending on water quality and usage
Description
Specifications
- Filter life Carbon Filters: 6-12 months
- Filter life Membrane: 3-6 years
- Filter life remineraliser: 2 years
- 0.0005 Micron
- Maximum flow rate: 3 litres per minute
- Maximum filter output: 200 litres per day
- Warranty: 5 years (housing)
- Temperature Range: 5°C – 25°C
- Water source: Townwater (Mains)
- Dimensions System: 33 cm (L) x 18 cm (H) x 20 cm (W)
- Dimension 5-litre storage tank: 32 cm (W) x 20 cm (D)
- Watermark Certificate Number 52014
Certified Under Sink Water Filtration
This system meets the WaterMark specification AS/NZS 3497 Drinking water treatment unit – Plumbing requirements.
Certificate Number 52014.
- Aluminium
- Barium
- Cadmium
- Chlorine
- Chromium
- Copper
- Cryptosporidium & Giardia
- Cysts
- e. Coli Bacteria
- Fluoride
- Heavy Metals
- Hydrocarbons
- Iron
- Lead
- Manganese
- Mercury
- Microplastic
- Nitrate
- PCB’S
- Pesticides & Herbicides
- PFAS
- Potassium
- Radium
- Sediment, Dirt & Rust
- Selenium
- Sodium
- Aluminium
- Barium
- Cadmium
- Chlorine
- Chromium
- Copper
- Cryptosporidium & Giardia
- Cysts
- e. Coli Bacteria
- Fluoride
- Heavy Metals
- Hydrocarbons
- Iron
- Lead
- Manganese
- Mercury
- Microplastic
- Nitrate
- PCB’S
- Pesticides & Herbicides
- PFAS
- Potassium
- Radium
- Sediment, Dirt & Rust
- Selenium
- Sodium
Everything You Want to Know
What's included in the system
This reverse osmosis water filter comes pre-assembled with the first set of cartridges, housing, tank, tap, hoses, screws, locking clips, and all components required for installation (excluding tools).
How often do I need to change the cartridges and how much do they cost?
Carbon Filters (2x): every 12 months (2x $69)
Membrane: Every 3–6 years – depending on water quality and usage ($149)
Remineraliser: Every 2 years (AlkaHydrate ($89), Or Omnupure Alkaliser ($119)
Is this the right RO system for me?
If you want pure, perfectly balanced drinking water but don’t want to sacrifice all your under-sink space, this Compact 4-Stage is our most popular chouce. It removes the nasties and adds the essential minerals back in.
Live in a high-sediment area like parts of Central QLD, WA or SA? Consider our Ultra High Purity 5-Stage RO System for added protection against fine sediment and longer cartridge life.
What’s the difference between the Alkahydrate and the Omnipure remineraliser?
There is no performance difference — it simply comes down to personal preference in brand or price.
Can I use this RO system for tank and bore water?
This system is best suited for town (mains) water. Tank water sources often lack the required water pressure required for RO systems. For tank or bore water, please explore our Rain Water Tank Filter options.
Replacement Filter Cartridges for
Compact UHP Under Sink Reverse Osmosis System with Alkaliser – 4 Stage
We know you want to protect your family from toxins without stripping the water dead. That’s why we don’t compromise on components. Your system is powered by genuine Omnipure filters—manufactured in the USA for over 50 years to deliver consistent, certified purity you can taste.
Effectively reduces PFAS, Chlorine, Chemicals, Taste & Odour. NSF 42 certified. For best results replace every 12 months or 7,500L depending on water quality. Made in USA ($69).
Effectively removes up to 99% of PFAS, fluoride, microplastics, bacteria. The membrane screens to 0.0005 micron for pristine drinking water. Replace every 3-6 years. Made in USA ($149).
4th Stage AlkaHydrate OR Omnipure Alkalising Cartridge
The Omnipure Alkaliser OR AlkaHydrate Alkaliser raises pH levels, producing alkaline oxygenating qualities for healthier water. Replace every 2 years ($89 / $119).
Smart, Simple Protection for Conscious Homes
You’ve researched water contaminants because you care.
But you shouldn’t need a chemistry degree to get clean water.
This RO water filter delivers pure filtration in a compact design that fits neatly under your sink.
- Stop second-guessing your tap water.
- Enjoy clean water with beneficial minerals.
- Cook, fill the kettle, and pour with quiet confidence.
It’s not just filtration.
It’s a simpler, healthier way to live — and feeling good about that choice.
3 Simple Steps to Safer Water — with Free Shipping Australia-Wide:
Choose your reverse osmosis system with desired faucet & tank and join our Pure Water Tribe.
Hand-built for you in Sydney and shipped with tracking so you know it’s on the way.
Install, turn on your tap and enjoy clean, ultra-pure water on demand.
Trusted by Thousands of Australian Families for Nearly a Decade
We founded Living Whole to make clean water simple. After nearly 10 years and 40+ years of combined expertise, we’ve helped thousands of Australians find water filters that are proven, dependable, and built for daily life.
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.
Retro with High Loop
Standard Retro faucet in a high loop design and long reach.
125mm W x 235mm H
Metro with High Loop
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
Euro with Long Reach
Standard Euro faucet in a long reach design.
150mm W x 230mm H
Side Lever High Loop 3-Way Mixer Chrome
The Side Lever High Loop 3-Way Mixer in Chrome features a sleek design, providing hot, cold, and filtered water from a single tap.
203mm W x 365mm H
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
3-Way Mixer Tap Standard Chrome
The 3-Way Mixer Standard Chrome comes in a sleek long-reach design, providing hot, cold, and filtered water from a single tap.
245mm W x 180mm H
Stainless Steel 3 Way High Loop Matte Black Mixer Tap
The Stainless Steel 3 Way Mixer Tap with high loop in a matte black finish, providing hot, cold and filtered water from a single tap.
225mm W x 400mm H
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.
How does the Reverse Osmosis Membrane Work?
A reverse osmosis membrane is a thin film with tiny pores that permit only water molecules to pass through, blocking all contaminants. It’s made of a semi-permeable material that allows water flow but blocks dissolved salts, organics, bacteria, and pyrogens. When pressurised, pure water diffuses through the membrane into the permeate flow, leaving contaminants behind. Reverse osmosis removes up to 99% of impurities.
Polluted water is forced through the semi-permeable membrane by mains pressure. Pure water passes easily, while pollutants larger than.0005 microns are washed away into a waste stream that goes down the drain. This waste stream contains all of the filtered-out contaminants, including pesticides, metals, bacteria, and viruses.
Additional information
| Weight | 2 kg |
|---|---|
| Dimensions | 25 × 25 × 42 cm |
| Alkaliser | Alkahydrate (made in Taiwan), Omnipure (made in USA) |
2 reviews for Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage
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Tas –
Quality filter and tap-ware with prompt. friendly pre and after sales service! 🙂
Living Whole –
Thank you so much for your kind words! We really appreciate your support and are glad you’re happy with both the products and our service 🙂
Kristina –
I love my 4-Stage Compact RO with Alkaliser! It was a bit of an investment but absolutely worth it. The water tastes soft and fresh, and I feel confident knowing it’s filtered to such a high standard.
Living Whole –
Thank you so much for your review, Kristina! We’re thrilled to hear you’re happy with your new RO system 😊.