Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage

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

Price range: $809.00 through $839.00 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
Filtered Water Storage Tank

Choose your filtered water storage tank.

Reverse Osmosis Tank 5 Litre Reverse Osmosis Tank 8 Litre +$77.00 Reverse Osmosis Tank 11 Litre +$88.00 Reverse Osmosis Tank 5 Litre

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

WaterMark Certification
NSF Certification

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).

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)

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.

There is no performance difference — it simply comes down to personal preference in brand or price.

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. 

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).

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)

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.

There is no performance difference — it simply comes down to personal preference in brand or price.

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.

1st & 3rd Stage Omnipure Q-Series Granular Activated Carbon Cartridge WL5540

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).


Omnipure Q Series GAC 10 WL5540 5 micron carbon filter replacement cartridge


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2nd Stage Omnipure Reverse Osmosis Replacement Membrane WL5572

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).


Omnipure Q Series RO Membrane filter replacement cartridge 10 Inch WL5572


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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).

Omnipure_and_Alkahydrate cartridges

Buy Alkahydrate


Buy Omnipure


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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.

How We Got Here And Why It Matters

We founded Living Whole to make clean water simple. After nearly 10 years and 30+ years of combined expertise, we’ve helped thousands of Australians find water filters that are proven, dependable, and built for daily life.



Quality filter and tap-ware with prompt. friendly pre and after sales service! 🙂
Tas


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.
Kristina
Compact 4 stage Reverse Osmosis Water Filter

Trusted by Thousands of Australian Families for Nearly a Decade

We founded Living Whole to make clean water simple. After nearly 10 years and 30+ years of combined expertise, we’ve helped thousands of Australians find water filters that are proven, dependable, and built for daily life.

Compact 4 stage Reverse Osmosis Water Filter

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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 in Chrome features a sleek  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 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 with high loop in a matte black finish, providing hot, cold and filtered water from a single tap.

225mm W x 400mm H


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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
RO Under Sink Installation Diagram

Reverse Osmosis Tank

Reverse Osmosis Tank

See All Tank Features


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Installation Guides


Compact Under Sink RO 4-Stage Installation Guide


Faucet Installation Guide


Reverse Osmosis Tank Brochure


Reverse Osmosis Maintenance Guide