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

(7 customer reviews)

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

Choose Your Filter Options

Your under sink water filter includes everything you need to get it installed and deliver clean water with convenience.

Filtered Water Storage Tank

Choose your filtered water storage tank.

Reverse Osmosis Tank 5 Litre
(Optional) 3 Way Mixer Upgrade

Replaces existing mixer tap. No extra drilling required.
View taps.

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

US manufactured Omnipure filter cartridges made from NSF certified components.

Quality water filter cartridges built on 55 years of water filtration manufacturing experience.

Every 6-12 months

Omnipure Q Series Q5605 Sediment Replacement Filter Cartridge.jpg

Sediment Pre Filter

$44.00

Every 12 months

Activated Carbon Filters

$89.00

Every 3-6 years

Reverse Osmosis Membrane

$163.00

Every 2 years

OR

Remineralising & Alkalising Stage

Alkahydrate $89.00

Omnipure $119.00

Under Sink RO Filter Installation

Specifications

  • Warranty: 5 years (housing)
  • Temperature Range: 5°C – 25°C
  • Water source: Townwater (Mains) 
  • Dimensions System: 32 cm (W) x 42 cm (H) x 13 cm (Deep)
  • Dimension 5-litre storage tank: 32 cm (H) x 20 cm (D)
  • Watermark Certificate Number 52014
  • 0.0005 Micron
  • Maximum flow rate: 3 litres per minute
  • Maximum filter output: 200 litres per day
5 Stage Reverse Osmosis Water Filter Dimensions 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

Ready to order?

Your under sink water filter comes with everything included and ready to be installed for immediate use.

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 filtered water flow and can be installed standing upright or lying on their side to easily fit around your plumbing.

reverse osmosis filtered water storage tank dimensions diagram

Filtered Water Taps

Your system includes a dedicated filtered water 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)

Ready to order?

Your under sink water filter comes with everything included and ready to be installed for immediate use.