“Countertop Reverse Osmosis Water Filter with USA Omnipure Alkaliser – 4 Stage” has been added to your cart. View cart

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

$699.00 – $759.00 inc. GST

It should be easy to trust the water your family drinks.

US made filters and 0.0005 micron RO membrane remove fluoride, chlorine, PFAS, bacteria, viruses, microplastics, heavy metals.
A remineralisation stage adds essential minerals back into the water for a balanced taste.
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.
A complete no-electricity-required undersink system with filters, tap, tank, and all parts.
Filter replacement costs range from $69-$119 per year, plus $149 for the RO membrane every 3–6 years.

Alkaliser

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

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)

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

Description

Certified Under Sink Water Filtration

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

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 $69)
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.

Replacement Filter Cartridges

1st & 3rd Stage Omnipure Q-Series Granular Activated Carbon (GAC) Replacement Cartridge WL5540

Effectively reduces PFAS, Chlorine, Chemicals, Taste & Odour. For best results, we recommend replacing every 12 months or 7,500L depending on water quality. Made in USA ($69).

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).

4th Stage AlkaHydrate (Taiwan) OR Omnipure (USA) Alkalising Replacement Cartridge

The Omnipure Alkaliser OR AlkaHydrate Alkaliser raises pH levels, producing alkaline oxygenating qualities for healthier water. Replace every 2 years ($89 / $119).

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.

How We Got Here And Why It Matters

When we first looked into water filters, we felt overwhelmed too. That’s why we started Living Whole – built on research and trusted products. Nearly 10 years on, with 40+ years of combined team experience, we’ve helped thousands find the right filter for their home. Every product we offer has been carefully researched and chosen because it works – and because we use it ourselves.

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

At Living Whole, we understand you want to feel confident about what you’re putting into your body. That means having pure trustworthy water right from your tap — no second-guessing, no stress.

The frustrating reality is that tap water often contains unwanted contaminants like chlorine, PFAS, microplastics, and heavy metals, which makes you feel worried and overwhelmed about your family’s wellbeing.

We believe you shouldn’t need a science degree just to ensure your home’s drinking water is safe.

That’s why we created the Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage. It’s designed to fit neatly into small spaces and make clean living simple.

Here’s how it works:

Choose your setup — whether for tap or tank water
We assemble your 4-stage RO system with remineraliser and send it ready to go
Install it under your sink and enjoy ultra-pure, alkaline water every day

Order your reverse osmosis filter today so you can stop compromising on water quality and start drinking with clarity, confidence, and peace of mind.

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

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 water filter 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

High Loop Stainless Steel

High Loop Stainless Steel -Brushed Chrome finish.

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

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)

Reviews

There are no reviews yet.

Be the first to review “Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage”