H2O-US3 water purifier cartridge is a unique 6-stage purification system manufactured in the USA , and sold throughout the World for over 30 years. H2O International UK is the exclusive distributor of these products in the UK and parts of Europe since 2009, and our high quality water filters are trusted by thousands of households and families.

The H2O-US3 connects quickly and easily to any existing drinking water syste,. The water purifier includes push fit fittings for easy connection to existing 1/4" pipework. Buy as a replacement for existing H2O water purifiers. OR replace any existing water filter.

Why are H2O water purifiers better than other drinking water systems?
We supply longlife, high capacity water purifiers which removes 100's of contaminants and water additives. The US3 cartridge purifies up to 90,000 litres of water over 3 years before needing replacing. Our unique 6-stage purification process ensures that you benefit from high quality purified water which is remineralised for best nutrition. The longlife nature of our H2O UK systems ensures the BEST value for money in the UK: 7 litres of purified water costing just 1p!
  • Longlife - only replace your filter every 30 - 36 months.
  • High quality water - remineralised water with removal of 100's of additives and contaminants potentially found in municipal tap water. Bacterial control prevents bacteria and funghi from growing inside the filter over the long-term.
  • Value for money - cheaper than bottled water and many other water filters (when compared over 36 months).
  • Fit-and-forget - other filters need replacing every 6 months.
  • Easy to fit - full instructions provided. Connects in a couple of minutes to existing 1/4" pipework due to push-fit fittings.
  • Eco-conscious - less plastic going to landfill and better than single-use plastic used for bottled water.
  • Compact - fit easily underneath a sink.
  • Experience - 12 years experience of the UK market, and 30 years in the USA and other countries.
H2O unique water purification process

The H2O water purifier systems contain a patented bacteriostatic media to prevent bacteria growth inside the filter. We also use a natural carbon that removes over 100 EPA listed contaminants. The use of KDF 55, a patented and NSF listed media along with the use of the finest Coconut Shell Granular Activated Carbon ensures the effective removal of chlorine and other contaminants that may be present in your water. Apart from the contaminant removal aspects of our filters, we importantly re-introduce trace minerals back into your water with our unique Ryolite. This results in water which is remineralised with increased pH for better tasting water.


Dimensions of filter: 43.20cm (h) x 10.20cm (d) 

Weight: 3.5kg

Flow Rate: 3.8 litres per minute

Warranty: 12 months pro-rata

Send us a message if you have ANY questions. We also sell the cartridges with full installation kits if you need a tap, tubing and valves.