Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage
$709.00 – $739.00 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.
- 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.
- Average Annual replacement cost: $207–$232, depending on water quality and usage
Description
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 (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
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).
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.
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 life.
Clean Water Shouldn’t Be Complicated
At Living Whole we know you want water you can trust – clear, safe, and ready straight from your tap.
But most tap water tells a different story. It often carries chlorine, fluoride, PFAS, microplastics, and heavy metals, leaving you worried an second-guessing what’s in every glass.
You shouldn’t need a science degree to make sure your water is safe.
That’s why we created the Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – to make clean living simple.
You chose your setup, we assemble your under sink reverse osmosis for you, and you’ll enjoy ultra-pure, great-tasting water on demand.
Enjoy the peace of mind that comes with knowing every glass of water in your home is clean, pure, and safe.
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.
Additional information
| Weight | 2 kg |
|---|---|
| Dimensions | 25 × 25 × 42 cm |
| Alkaliser | Alkahydrate (made in Asia), Omnipure (made in USA) |
1 review for Compact Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 4 Stage
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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 😊.