Aquasana OptimH2O® AQ-RO-3 Under Sink Reverse Osmosis Water Filter

Aquasana OptimH2O® AQ-RO-3 Under Sink Reverse Osmosis Water Filter

Aquasana OptimH2O® AQ-RO3-R Replacement Filter Cartridges
Aquasana OptimH2O® AQ-RO3-RO Membrane Replacement Filter Cartridge
Aquasana OptimH2O® AQ-RO3-RM Remineralizer Replacement Filter Cartridge

Product Description expand_more


The Aquasana OptimH2O is the first ever domestic filtration system that will remineralise your drinking water after filtering it. As well as remineralisation it also utilises reverse osmosis and Claryum filtration technology. By doing so it delivers maximum health benefits and hydration. 

You can find the performance sheet here

In tests, it has been proven to effectively remove fluoride and significantly reduce the amount of 74 contaminants including organic chemicals such as herbicides and pesticides. Furthermore, the Aquasana OPTIMH2O Reverse Osmosis and Claryum Technology water filtration system is not only affordable but easy to install and maintain. Replacement cartridges are also affordable and easy to change and what’s more is that they are readily available.


First of all, the Aquasana OptimH2O water filtration system utilises reverse osmosis to remove any dissolved solids, such as fluoride and arsenic, that are smaller than 1 micron. Next the water passes through activated carbon to reduce the amount of herbicides, pesticides, volatile organic compounds and MTBE before passing through catalytic carbon which tackles chlorides and chloramines. The ion exchange filters out any heavy metals such as lead and mercury before the absolute sub-micron filtration stage, which captures any asbestos chlorine resistant cysts such as giardia and cryptosporidium. The final stage is remineralisation where minerals are replaced, improving pH and alkalinity.


The result is delicious and safe drinking water for the whole family. The Aquasana OPTIMH2O Reverse Osmosis and Claryum Technology water filtration system is even certified to NSF/ANSI Standards 42, 53, and 58. 

How Often Do You Need To Replace Filters?

1 Year RO Membrane Life
1 Year Remineralizer Life
6 Month Carbon / Claryum Filter Life

So, if you're looking for a convenient way to obtain healthy drinking water, then the Aquasana OptimH2O is your answer. It has even been tested and certified to NSF/ANSI Standards 42, 53, and 58.

Product Video

Key Features 

  • NSF/ANSI tested and certified
  • Flow rate of 0.8gpm
  • Decreases amount of 74 contaminants
  • Decreases fluoride and mercury by 95%
  • Decreases chlorine and arsenic by 97%
  • Decreases lead and asbestos by 99%
  • Reverse osmosis
  • Activated carbon
  • Catalytic carbon
  • Ion exchange
  • Absolute sub-micron filtration
  • 90-day guarantee and 2 year warranty
  • Produces up to 13 gallons of water
  • 40-100 psi operating pressure:
  • Operating Temperature: 4°C to 37°C
  • 30.5cm x 11.5cm x 32cm manifold dimension
  • 41cm x 28cm tank dimension

Specifications expand_more

Model: AQ-RO-3
Pressure Range: 3.5 - 7 bar (40 - 100 psi)
Temperature Range: 4.4 - 37.6°C (40 - 100°F)
Warranty: 2 Years
Dimensions: 31.8 cm (H) x 11.4 cm (D) x 30.5 cm (W)
Weight: 5.5 KG

Common Queries expand_more

How long does delivery take?

Deliveries to the UK are sent with a Free Next Working Day service* that operates from Monday to Friday. This timeframe increases to 2 days for UK offshore islands and Scottish highlands.

Deliveries abroad will vary in length depending on the destination, for more specific information please contact us.

*Please be aware that orders must be placed before 15:00 to receive them on the following working day. Orders placed after this time will be dispatched on the closest following working day instead.

How much will delivery cost?

All orders destined for the UK with a total value of £100 or more are elligible for Free Delivery. Orders with a lower value will have a standard delivery charge of £3.95.

For a full list of all our available delivery options, please see our delivery information page.

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