Ready to Transform the Water Quality in Your Entire Home?
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.
System Components Overview
This system consists of three individual filter housings and three filters. The setup is as follows:
Housing 1 – 4.5 x 20” Antibacterial Grey Housing with Active Ceramics Whole House Filter. Replaced every 3 years or 300,000 litres.
This filter uses a patented blend of 4 active ceramics, removing chlorine, hormones, fluoride, heavy metals, and adding antioxidants and minerals back into the water. It also raises alkalinity and kills bacteria including E. coli and Pseudomonas.
Housing 2 – 4.5 x 20” Carbon Block 5 Micron. Reduces chlorine, taste, odour, and certain VOCs. Rated for ~46,000 litres (6 months typical).
Housing 3 – 4.5 x 20” GAC + KDF Process Media Filter. Targets chlorine, pesticides, organic material, hydrogen sulphide, metals, odours, fungi, and algae. Ideal for homes with low pressure. Life: 12–18 months or 200,000 litres.
Includes brackets, screws, and housing spanner. Installed footprint: 655mm x 606mm.
Environmental Benefits
After use, the active ceramics can be added to soil as a fertiliser to improve plant health and drainage. Plastic housing can be recycled.
Note: Whole house filters do not remove limescale. For scale removal, see our Water Softeners collection.
Robust, Long-Lasting, and Environmentally Friendly
- Filtered water from every tap
- No more bottled water
- Removes chlorine, toxins, metals, hormones, fluoride, and harmful bacteria
- Improves skin and hair by removing chlorine from shower water
- Enhances pH and alkalinity
- Increases antioxidants
- No system backwashing required
Pressure Notice: Avoid installing if standing pressure is below 2.5 bar.
What’s Included?
The package comes with:
- Filter One: Active Ceramics (3 years / 300,000L)
- Filter Two: NSF 5 Micron Carbon Block (6–12 months)
- Filter Three: KDF + GAC Cartridge (12 months)
- 3 x Antibacterial housings
- Brackets and screws
- Large housing spanner
Installation Location
No — it does not need to be installed under the sink. It can be placed at the main cold water entry point in a utility room, garage, or suitable area.
Upgrade Your Home
Filters every tap: bathrooms, showers, sinks & toilets
Reduces Chlorine & Contaminants
Eco-Friendly
Eliminates bottled water waste
Fast, Free Delivery
Quick dispatch with no hidden fees
Warranty Information
3-year warranty
Covers repair or replacement where defects arise from manufacturing issues.
Register here: Osmio Warranty Registration
Full Specification
| 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 |
