Ultra High Purity Under Sink Reverse Osmosis System with Alkaliser – 5 Stage

You’ve done your research and know exactly what you want (and what you don’t want in your water).

  • 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. 
  • Annual filter replacement costs $202, remineraliser every 2 years $89, and $149 for the RO membrane every 3–6 years.

Price range: $939.00 through $969.00 inc GST

(7 customer reviews)

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

Certified Under Sink Water Filtration

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

Customer Reviews

(7 customer reviews)
  • EmmaApril 8, 2026

    The filtration system was a breeze to set up and operate, and the customer support has been absolutely fantastic.

  • LeroyNovember 13, 2025

    I am absolutely thrilled with my reverse osmosis system. The water quality is exceptional, and it has made a massive difference in keeping me hydrated. After doing plenty of research to find the best balance of premium quality and affordability, I'm incredibly glad I chose Home Water Filters. The team provided amazing support when I needed help troubleshooting the installation, and were fantastic to deal with. They are so helpful and deeply knowledgeable. I'm one highly satisfied customer!

  • BrittanyJuly 23, 2025

    We absolutely love our water filtration system! The flavour is a massive step up from regular tap water, and it gives me such peace of mind knowing my family is drinking the purest water available. Plus, the crew provided amazing support when it was time for a filter change. I can't recommend them enough!

  • Emily ParksMarch 16, 2025

    I was well aware of the fluoride and impurities in our tap water but wasn't sure which filtration setup to go with. After doing some homework, I decided on the 5-stage reverse osmosis system, and I couldn't be happier. Setting it up was a breeze, the water tastes incredible, and I finally have peace of mind knowing my family is drinking truly clean water every day.

  • Andrew HeerdNovember 19, 2024

    Fantastic setup!

  • James FoxAugust 14, 2024

    Had a wonderful phone conversation with the shop and they were incredibly helpful. After getting a plumber to handle the installation, everything is going well. The initial cloudiness from the air has completely disappeared, and the water quality just improves with use. The taste is excellent now.

  • BeckaMay 2, 2024

    Totally worth every penny! Our entire family loves the improved taste of the water. Huge thanks to the team for their outstanding customer service.

under sink reverse osmosis water filter installed

Replacement Filter Schedule

Omnipure Q Series Q5605 Sediment Replacement Filter Cartridge.jpg

Sediment Pre Filter

Every 6-12 months

$44.00

Activated Carbon Filters

Every 12 months

$89.00

Reverse Osmosis Membrane

Every 3-6 years

$163.00

OR

Remineralising & Alkalising Stage

Every 2 years

Alkahydrate $89.00

Omnipure $119.00

Under Sink RO Filter Installation Diagram

Designed for quick, hassle-free setup. Any qualified plumber can easily install this system in 1 hour or less, barring any unusual under-sink complications. See the diagram below for how the lines connect to your chosen tap configuration.

Dedicated Tap

under sink reverse osmosis water filter installation diagram dedicated filtered water tap

3 Way Mixer Tap

under sink reverse osmosis water filter installation diagram 3 way mixer tap

Reverse Osmosis Storage Tank Sizing

Choose the compact 5L tank for 1–3 people or limited under-sink space. Upgrade to a larger tank for families of 4+ or heavy cooking use. All options deliver instant high-pressure flow and can be installed standing upright or lying on their side to easily fit around your plumbing.

RO storage tank sizes

Filtered Water Taps

Your system includes a standard filter tap. If you prefer to avoid drilling an extra hole, you can choose one of our 3-way mixer upgrades.
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.

Dedicated Filtered Water Taps

Enhance your kitchen with the ‘Retro’ – a sleek, standard filter faucet designed to pair perfectly with your under-sink water filtration system

125mm (W) x 235mm (H)

The Metro with High Loop Faucet with bright chrome finish is designed to pair perfectly with your under-sink water filtration system.

160mm (W) x 250mm (H)

Brushed chrome finish, this elegant fixture is designed to seamlessly integrate with your chosen under sink water filtration system. 

180mm (W) x 300mm (H)

The Euro with Long Reach Faucet with bright chrome finish is designed to pair perfectly with your under-sink water filtration system.

150mm (W) x 230mm (H)

3 Way Mixer Taps

Sleek and modern with a ong reach. It’s the perfect companion for your chosen under-sink water filtration system.

240mm (W) x 360mm (H)

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)

The Stainless Steel Premier 3-Way Mixer Tap features a matte black finish, providing hot, cold, and filtered water from a single tap.

210mm (W) x 290mm (H)

The Stainless Steel 3 Way High Loop Matte Black Mixer Tap features a high loop design in a matte black finish.

225mm (W) x 400mm (H)