Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 5 Stage
Ultra-Pure Filtration for Everyday Peace of Mind
You want to feel confident about the water your family drinks every day but it’s hard with contaminants like fluoride, PFAS, heavy metals, or microplastics in our tap water. And let’s be honest: You shouldn’t have to be an expert to understand what’s in your water.
That’s why we’ve designed this 5-stage ultra-high purity undersink reverse osmosis water filter that goes above and beyond. Often referred to as the gold standard in water purification, reverse osmosis removes virtually all unwanted elements from your water and restores essential minerals for better taste and balance, all in a compact system tailored for Australian homes.
Because RO is such a thorough process, it filters water slowly — so we’ve added a tank to ensure you have clean, mineral-balanced water ready whenever you need it.
Meet Our Reverse Osmosis System
If you’re looking for the highest level of filtration, this undersink water filter system is the gold standard. This powerful and efficient reverse osmosis system fits neatly under your sink and delivers ultra-clean water straight from your tap — no electricity needed.
Here’s what makes it different:
- 0.0005 micron RO membrane – filters out the smallest particles, including fluoride, chlorine, chloramine, PFAS, bacteria, viruses, and even nano-plastics.
- Remineralisation stage – adds back calcium and magnesium for taste and balance.
- NSF-certified components – includes the WL5640 carbon filter, part of the certified Omnipure 5640 Series under NSF/ANSI Standard 42.
- Handbuilt & wet-tested in Sydney– for quality and performance you can trust.
- Built to Last – made from non-toxic BPA free materials and comes with a 5-year housing warranty.
- WaterMark certified – meets AS/NZS 3497:1998 standards.
- All-inclusive kit – comes with tap, tank, and every part you need for a clean, hassle-free installation.
- No electricity required – efficient and reliable without adding to your power bill.
What Are You Avoiding?
- No more second-guessing if you water is safe to drink
- No more worries about chemicals like PFAS or Chlorine
- No more research fatigue from trying to figure out what works
What You’ll Gain
- You’ll feel good knowing your water is as clean as it can be
- Freedom from bottled water and kitchen clutter
- Control of what goes into your body
$799.00 – $829.00 inc. GST
Description
Quick Answers
What’s the difference between the 5-stage and 4-stage RO system?
The 5-stage system includes a remineralisation filter that adds essential minerals like calcium and magnesium for better taste and balance. The 4-stage system does not include this final stage.
Can I use this RO system for tank and bore water?
This system is best suited for town (mains) water. For tank or bore water, please explore our Rain Water Tank Filter options that provide additional sediment and bacteria removal commonly found in untreated sources.
How often do I need to change the cartridges and how much do they cost?
Sediment Pre-Filter: Every 12 months ($89)
Carbon Filters (2x): every 12 months (2x $69)
Membrane: Every 3–6 years – depending on water quality and usage ($149)
Remineraliser: Every 2 years ($89)
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.
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 320W x 420H x 110D mm.
- 5 litre storage tank, dimensions 317W x 203D mm.
- 5 Year Warranty
Filter Cartridges
Sediment Pre-Filter (Made in USA)
Change every 6-12 months
Mechanical filtration removes fine sediment particles.
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, parasites, 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
Certified Under Sink Water Filtration
This system meets the WaterMark specification AS/NZS 3497 Drinking water treatment unit – Plumbing requirements.
Certificate Number 52014.
- Fluoride
- Aluminium
- Barium
- Cadmium
- Chlorine
- Chloramine
- Chromium
- Copper
- Cryptosporidium & Giardia
- Cysts
- e. Coli Bacteria
- Heavy Metals
- Hydrocarbons
- Iron
- Lead
- Manganese
- Mercury
- Microplastic
- Nitrate
- PCB’S
- PFAS
- Potassium
- Radium
- Sediment, Dirt & Rust
- Selenium
- Sodium
- Fluoride
- Aluminium
- Barium
- Cadmium
- Chlorine
- Chloramine
- Chromium
- Copper
- Cryptosporidium & Giardia
- Cysts
- e. Coli Bacteria
- Heavy Metals
- Hydrocarbons
- Iron
- Lead
- Manganese
- Mercury
- Microplastic
- Nitrate
- PCB’S
- PFAS
- Potassium
- Radium
- Sediment, Dirt & Rust
- Selenium
- Sodium
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.
Spring Loaded
Standard Spring Loaded faucet comes with a black lever and long reach design.
200mm W x 210mm H
Mode
Standard Mode faucet comes in a bright chrome finish and features a high loop design.
150mm W x 290mm H
Retro
Standard Retro faucet comes in a bright chrome finish and features a high loop design.
125mm W x 235mm H
Euro with Long Reach
Standard Euro faucet comes in a bright chrome finish and a long reach design.
150mm W x 230mm H
Euro with High Loop
Standard Euro faucet comes in a bright chrome finish and features a high loop design.
150mm W x 230mm H
Metro
Standard Metro faucet comes in a bright chrome finish and features a in a high loop design.
160mm W x 250mm H
Antique
Standard Antique faucet comes in a bright chrome finish and features a high loop design.
180mm W x 280mm H
Fin
Standard Fin faucet comes in a bright chrome finish and features a high-arc, minimalist design.
135mm W x 250mm 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
New Nova 3-Way Mixer Tap Polished Chrome
The New Nova 3-Way Mixer Tap Polished Chrome features a sleek long-reach design, providing hot, cold and filtered water from a single tap.
200mm W x 210mm H
Stainless Steel High Loop 3-Way Mixer Tap
The Stainless Steel High Loop 3-Way Mixer Tap features an modern design in a brushed chrome finish, providing hot, cold and filtered water from a single tap.
225mm W x 400mm H
Premier Stainless Steel Matte Black 3-Way Mixer Tap
The Stainless Steel Premier 3-Way Mixer Tap features a matte black finish and long reach, providing hot, cold, and filtered water from a single tap.
210mm W x 290mm H
Premier Stainless Steel Tall 3-Way Mixer Long Reach
The Premier Stainless Steel Tall 3-Way Mixer Tap features a sleek, modern long-reach design and delivers hot, cold, and filtered water from a single tap.
240mm W x 360mm H
Stainless Steel 3 Way High Loop Matte Black Mixer Tap
The Stainless Steel 3 Way High Loop Matte Black 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
5 Stage Under Sink Reverse Osmosis System
1st Stage Omnipure Sediment Pre Filter Block WL5605
Removes particulate matter such as sediment, rust, dirt, cloudiness from the water. Made in USA. Filter needs replacing every 6-12 months. Made in USA.
2nd & 5th Stage Omnipure GAC Carbon Filter WL5640
Effectively reduces PFAS, Chlorine, Chemicals, Taste & Odour. We recommend replacing every 6-12 months or 7,500L depending on water quality. Made in USA.
3rd Stage Omnipure Reverse Osmosis Replacement Membrane WL5572
Effectively removes up to 99% of PFAS, fluoride, viruses, bacteria and parasites. The membrane screens to 0.0005 micron for pristine drinking water. Replace every 3-6 years. Made in USA.
4th Stage AlkaHydrate OR Omnipure Alkalising & Remineralising Cartridge
The Omnipure Alkaliser OR AlkaHydrate Alkaliser raises pH levels, producing slightly alkaline oxygenating qualities for healthier water. Replace 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. Reverse Osmosis systems are consistently one of the better PFAS water filters and water filters that filters fluoride as well.
Certification
You can trust this reverse osmosis system to deliver safe, clean water. It meets the stringent WaterMark AS/NZS 3497 standards for structural durability under pressure, certified under number 23124. WaterMark also mandates that all components, including the filter cartridges, comply with NSF/ANSI 42 standards or higher for water filtration safety.
These systems are hand-assembled right here in Australia and wet-tested to guarantee superior quality. Our Watermark certification indicates full compliance with Australian plumbing codes, so you can have total peace of mind knowing your RO system adheres to local regulations.
Additional information
| Weight | 2 kg |
|---|---|
| Dimensions | 25 × 25 × 42 cm |
| Alkaliser | Alkahydrate (made in Asia), Omnipure (made in USA) |
4 reviews for Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 5 Stage
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Emily Parker –
I knew our water had fluoride and other contaminants, but I wasn’t sure what system to choose. After doing some research, I decided on the 5-stage reverse osmosis system and I’m so glad I did. It was easy to install, the water tastes amazing, and I finally feel at ease knowing my family is drinking clean, filtered water every day.
Andre van Heerden –
Great System
Living Whole –
Hi Andre, thanks for your review!
Jim Fox –
Brett was very helpful on the phone. Got a plumber to install system and thus far all is good. The initial aeration in the water has gone and taste improves the more the system is used. Now taste is quite good.
Living Whole –
Thank you for your feedback, Jim! Great to hear the system is working well and you’re happy with the water taste.😊
Vath Lee –
I found Janka to be very helpful and responsive to my queries.
Living Whole –
Hi Vath, thanks for your feedback! We’re glad to hear Janka was able to help.🙂