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

Name: Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser - 4 Stage | Living Whole
Availability: InStock

Ultra-Pure Filtration. Remineralised for Great Taste and Balance.

You want to trust the water your family drinks. But when tap water can contain fluoride, PFAS, heavy metals, and microplastics, that trust quickly fades. It shouldn’t be so hard to know what’s in your water — or how to remove it.

This 4-stage ultra purity undersink RO system system is the gold standard in water purification, removing virtually all contaminants and restoring essential minerals. Compact yet powerful, it’s made for Australian homes with limited under-sink space. And because RO filters water slow, it includes a tank so you’ll always have clean water ready to go.

What makes it different?

0.0005 Micron RO Membrane – filters out even the tiniest particles including fluoride, PFAS, bacteria, viruses, heavy metals, and microplastics.
NSF-Certified Components – Featuring the WL5540 carbon filter, part of the NSF/ANSI Standard 42 certified Omnipure 5540 Series.
Handbuilt in Australia – Wet-tested and assembled locally for performance you can trust.
Built to Last – comes with a 5-year housing warranty.
WaterMark Certified – Meets AS/NZS 3497:1998 standards.
Everything Included – Tap, tank, tubing, and fittings — ready for DIY install or your local plumber.
No electricity required – efficient and reliable without adding to your power bill.

What Are You Avoiding?

No more second-guessing what’s flowing from your tap
No more exposure to fluoride, PFAS, microplastics, heavy metals
No more bottled water and clutter on your countertop

What You’ll Gain

Confidence that every glass of water is ultra-pure
A system that quietly does the job
More space on your bench, free from bottles and clutter

Alkaliser

Alkahydrate (made in Asia)
Omnipure (made in USA)

Clear

Filter Tap *

Choose the tap for your under sink water filter

3-Way Mixer Tap Standard Chrome +$319.00

Reverse Osmosis Tank *

Leak Stopper and Filter Life Monitor

Leak Stopper and Filter Life Monitor incl. Adaptors (+$99.00)

$679.00 – $739.00 inc. GST

SKU: N/A Categories: Reverse Osmosis Water Filters, Fluoride Water Filters, PFAS Water Filters, Under Sink Reverse Osmosis, Under Sink Water Filters

Description

We've Been In Your Shoes

We know how confusing it can be to choose the right water filter. When we first started looking into water quality for our family, we didn’t know where to begin. What we found confused us: misleading claims and products that looked good on the surface but didn’t deliver. That search turned into a mission. With over 40 years of combined experience and nearly a decade in business, we’ve helped more than 2,000 families find clarity and confidence. Every product we offer has been carefully researched, tested, and chosen because it works – and because we use it ourselves.

Everything You Want to Know (At a Glance)

Quick Answers

What’s the difference between the Compact 4-stage and Compact 3-stage compact RO system?
This compact 4-stage reverse osmosis system includes a final remineralisation cartridge that adds back calcium and magnesium for improved taste and mineral balance. The compact 3-stage RO system skips this step, focusing purely on removal without adding minerals back in.

What’s makes this Compact system different?
The size! The compact system is with 30x18x17cm a lot more space efficient than the regular 32x42x11cm.

Can I use this RO system for tank and bore water?
Reverse osmosis systems need consistent water pressure to push water through the membrane. Tank or bore water systems often don’t provide enough pressure and may contain sediment or bacteria that can clog or damage the system. For these sources, we recommend our Rain Water Tank Filter systems, which are designed to handle untreated water more effectively.

How often do I need to change the cartridges and how much do they cost?
Carbon Filters (2x): every 12 months (2x $59)
Membrane: Every 3–6 years – depending on water quality and usage ($149)
Remineraliser: Every 2 years (from $89)

Specifications

Maximum flow rate of 3 litres per minute
Max filter output of approximately 200 litres per day (@60psi 25ºC)
Micron Rating: 0.0005 micron
RO Filter system dimensions 300W x 180H x 170D mm
5 litre tank Dimensions 317W x 203D mm
5 year warranty.

Filter Cartridges

Carbon Pre-Filter (Made in USA)
Change every 6-12 months
Removes PFAS, chlorine, pesticides, heavy metals, and other organic pollutants.

Ultrafine TFC RO Membrane (Made in USA)
Change every 3-6 years
Filters to 0.0005 microns, removing PFAS, viruses, bacteria, microplastics, fluoride, and hydrocarbons.

Alkalising Filter
Change every 2 years
Omnipure Remineraliser (made in USA) or AlkaHydrate (made in Asia) — adds essential minerals (Calcium, Magnesium, Potassium) and raises pH, improving water quality.

Coconut Carbon Post-Filter (Made in USA)
Change every 6-12 months
Final polishing filter delivering pure, clean water.

Hassle-Free Installation

Installation of your reverse osmosis 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!

Storage Tanks

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.

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.

Safe water shouldn’t be a science project.

Here’s how it works:

Choose your setup (tap, tank, add-ons)
We assemble your under sink filter for you and send it with everything you need.
Install it under your sink and enjoy ultra-pure, great tasting water on demand.

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

Certified Under Sink Water Filtration

This system meets the WaterMark specification AS/NZS 3497 Drinking water treatment unit – Plumbing requirements.
Certificate Number 52014.

Compact, Space Saving Design

Our Undersink Reverse Osmosis System is designed to fit neatly into even the smallest under-sink spaces — no bulky or complicated setups. It’s the perfect solution for modern kitchens where space is limited but clean, purified water is a priority. Quiet, efficient, and discreet, it delivers high-quality filtration without taking over your cupboard.

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 Tap in Chrome features a sleek high-loop 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 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

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

Replacement Filter Cartridges for Compact Ultra High PurityUndersink Reverse Osmosis System with Alkaliser

1st & 3rd Stage Omnipure GAC 10" WL5540

The system requires 2 of these cartridges to be replaced
every 6-12 months

2nd Stage Omnipure Reverse Osmosis Replacement Membrane WL5572

The system requires 1 these cartridges to be replaced
every 3-6 years dependent on water quality.

4th Stage AlkaHydrate Alkalising & Remineralising Cartridge (select one)

The system requires 1 these cartridges to be replaced
every 2 years.

4th Stage USA Omnipure Alkaliser & Remineralising Cartridge WL5550 (select one)

The system requires 1 these cartridges to be replaced
every 2 years.

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.

Installation Guides

Additional information

Weight	2 kg
Dimensions	25 × 25 × 42 cm
Alkaliser	Alkahydrate (made in Asia), Omnipure (made in USA)

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