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Osmio PRO-III-XL Ultimate Whole House Water Filter System

by Osmio
£699.00

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 Osmio PRO-III-XL Ultimate Whole House Water Filter System

Ready to Transform the Water Quality in Your Entire Home?

A whole house filter linked to a house pouring purified water

The Osmio PRO-III-XL Ultimate Whole House Water Filter System is one of our premier models, perfect for those who demand the very best in water filtration.

Whole house systems are often paired with either salt-based or non-salt-based softeners for optimal results and a reverse osmosis point-of-use system for the ultimate gold standard in home water treatment.

Enjoy the convenience of filtered water from every tap, eliminating the hassle of using filter jugs or installing separate drinking faucets.

This unit efficiently removes chlorine, toxins, heavy metals, hormones, and fluoride, and targets harmful bacteria like E. coli and Pseudomonas.

No ongoing maintenance or system backwashing is required; simply replace the cartridge at a low cost when it expires.

Whether your home is small, medium, or large, this unit fits pipework up to 1” in diameter and performs best at flow rates up to 70 LPM.

The PRO-III-XL Ultimate is capable of eliminating numerous water impurities, including chlorine, toxins, and heavy metals, and it also eradicates any unpleasant tastes or odours from your water.

The Pro-III-XL features three separate filters and housing bowls, providing flexible installation options such as arranging them in an L shape to fit into corners.

A Whole house water system  with three filters installed A whole house water filer front view

This system consists of three individual filter housings and three filters. The setup is as follows:

Housing 1  4.5 x 20 Inch Antibacterial Grey Housing with Active Ceramics Whole House Filter. This filter is replaced every 3 years or 300,000 litres and is highly effective at the removal or reduction of a vast array of impurities in water including chlorine, hormones, fluoride, lead and so on.

This filter is also highly advanced and effective at killing and containing bacteria in water such as E-coli, Pseudomonas and other microorganisms. The filter uses a unique filtration method using a patented active ceramics blend, so it has 4 different active ceramics which treat the water in a different way and is completely unique. Not only that but the filter adds antioxidants and minerals back into the water after filtering and additionally makes water more alkaline by raising the pH value, usually increasing the pH to around 0.5 a point or more (however this could be more or less depending on a number of specific variables including the presence of certain dissolved solids and gases).

Housing 2  4.5 x 20 Inch Antibacterial Grey Housing with Carbon Block 5 Micron. This filter further reduces chlorine and nay taste and odour issues that may be present in the mains tap water.

The carbon block also reduces certain Volatile Organic Chemicals (VOC) from drinking water. The coconut base of the carbon also makes a slightly sweeter taste which is pleasant. The carbon block has a very high dirt holding capacity with virtually zero pressure drop.

The filter is rated for 46,000 litres so is usually changed every 6 months.

Housing 3  4.5 x 20 Inch Antibacterial Grey Housing with GAC and KDF Process Media Filter Cartridge. This cartridge primarily reduces the bad taste and odours of chlorine and other chemicals in the water. This filter contains Granular Activated Carbon (GAC) and Kinetic Degradation Fluxion (KDF). When these 2 are combined, they are known to kill algae and fungi, control bacteria growth and remove chlorine, pesticides, organic matter, rust, unpleasant taste and odour, hydrogen sulphide, iron, lead, nickel, chromium, cadmium, calcium, mercury and other organic compounds.

The filter is ideal for situations where you need a higher flow rate or have very low water pressure problems.

Filter Life: Approximately 12-18 months or 200,000 litres.

Includes brackets, screws, and a large housing spanner

The total footprint, when installed with the connecting nipples as depicted in the product image, measures 655mm x 606mm

Environmental Benefits

After the main active ceramics cartridge has served its purpose, you can extract the ceramics and use them to fertilize your garden, improving plant health and soil drainage. You can recycle the plastic housing with your everyday recycling.

Please note: Whole house filter systems do not remove limescale. For limescale removal, check out our Water Softeners section.

Close up of a housing cartridge for a water filter

Robust, Long Lasting, and Environmentally Friendly

  • Filtered water from every tap, eliminating the hassle of using filter jugs or installing separate drinking faucets.
  • No more bottled water.
  • Removes chlorine, toxins, heavy metals, hormones, and fluoride, and targets harmful bacteria like E. coli and Pseudomonas.
  • Enjoy showers with water that's de-chlorinated for smoother skin and hair.
  • pH-enhanced water with increased alkalinity.
  • Increases antioxidants for healthier water.
  • No ongoing maintenance or system backwashing is required; simply replace the cartridge at a low cost when it expires.

Pressure Loss: For best results and to avoid potential pressure issues, we recommend against installing this system if your current standing water pressure is below 2.5 bar

What's included?

The package comes fully equipped with 3 filters:

  • Filter One: Active Ceramics Large Whole House Filter: 3-year filter life or 300,000 litre capacity.
  • Filter Two: Pure NSF Certified 4.5 x 20 Inch 5 Micron Carbon Block - filter life 6 to 12 months depending on usage.
  • Filter Three: Osmio 4.5 x 20 Inch KDF and GAC Process Media Filter Cartridge - Filter Life: Approximately 12 months or 152,000 litres depending on usage and local water quality
  • 3 x Antibacterial grey housings with 1" BSP female ports
  • Brackets with screws 
  • Large housing spanner

*Life of filters may vary depending on water hardness and local water quality

Does it need to be installed under the sink?

No ,the system can be installed at the entry point of the cold water supply to your home, which could be a utility room, garage, or another area.

A vector of a house

Upgrade Your Home

Filters water for the whole house:
Showers, bathrooms, sinks, toilets

Three water droplets

Reduces Chlorine, VOCs, Contaminants

Ensures cleaner, safer water
for all the family

A plastic bottle with a line through it

Environmentally Friendly

No more bottled water !
Recyclable cartridges

A picture of a van going at speed

Fast, Free Delivery

Quickly dispatched with
no hidden charges


Warranty Information

  • 3 Years

The 3 year warranty covers the repair or replacement of all or part of your system if your system is found to be defective due to faulty materials or manufacture within 3 years of purchase. 

Warranty Registration to be done via Osmio:

Osmio Warranty Registration


Total Height 655mm
Total Width 606mm
Max Pressure 90 psi (6 bar)
Max Temperature 45°C (113° F)
Service Flow Rate up to 70 LPM @ 60 psi
Inlet/Outlet 1"
Housing Options Pressure Relief Vent Valve
Standing pressure loss ~0.5 Bar at 2.2 bar pressure

Complete Installation & Maintenance Guide

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Installation Manual

Available here today with fast, free delivery