Nemesis eH2O is effective on:


Campylobacter jejuni
Escherichia coli including (0157)
Enterococcus species
Helicobacter pylori
Legionella pneumophila
Pseudomonas aeruginosa
Staphylococcus aureus (including MRSA)
Samonella cholerasuis
Mycobacteria tuberculosis
Mycobacterium avium intracellulare
Acineobacter baumannii

Bacterial Endospores

Bacillus cereus
Bacillus subtilis
Clostridium difficile
Clostridium sporogenes


Aspergillus niger
Candida albicans
Trichophyton mentagrophytes


Adenovirus type 4, Bacteriophage MS2,Hepatitis A & B, Herpes type 1, HIV-1
Infectious bronchitis, Influenza including H1N1, H5N1 and H7N9, MS2 virus
Norovirus (Human and Murine), Orthopoxvirus, Polio enterovirus 1 & 2,
SARS-CoV-2 and all Coronaviruses


Zygosaccharomices bailii
Candida albicans


Botrytis (grapy mould)
Powdery mildew


Cryptosporidium muris
Cryptosporidium parvum

Please note: This is not an exhaustive list. Contact us for advice on any other pathogens.

Nemesis eH2O is supplied as a ready-to-use solution of 500ppm stabilised hypochlorous acid. This was the concentration employed in all of the Nemesis eH2O certification tests and in the efficacy evidence provided to the European Chemicals Agency (ECHA) to achieve active substance approval under the Biocidal Products Regulation (528/2012) Parts 1, 2, 3, 4 & 5.

Hierarchy of Microbial Resistance to Disinfectants

Microorganism Aqualution (Nemesis eH2O) BS EN tests
Most Resistant -- > Spores (eg C. difficile) BS EN 13704:2002
Mycobacteria (eg M. tuberculosis) BS EN 14204:2012
Non-Enveloped Viruses (eg Norovirus, Polio) BS EN 14476:2013
Fungi (eg Candida albicans) BS EN 13697:2001
Bacteria (eg MRSA, VRE, Acinetobacter) BS EN 1276:2009; BS EN 13697:2001; BS EN 1656:2009
Most Susceptible -- > Enveloped Viruses (eg Coronavirus, HIV, Influenza) BS EN 14476:2013
Adapted from Spaulding, 1957 and Rutala and Weber, 2014

The table above shows that enveloped viruses (such as that which causes COVID-19) are particularly susceptible to antiviral disinfectants.

All Nemesis eH2O products are tested to rigorous international standards and Nemesis eH2O is fully authorised under the Biocidal Products Regulation (BPR, Regulation (EU) 528/2012) for Parts 1 to 5 (Part 1: Human hygiene, Part 2: Disinfectants and algaecides, Part 3: Veterinary hygiene, Part 4: Food and feed area, Part 5: Drinking water).
Nb. Following Brexit, access to lists of approved disinfectants is available via the Health & Safety Executive website.

International Standards Log Reduction %age Kill
Bacteria EN 1276:2009; EN 13697:2001; EN 1656:2009 >6 99.9999
Spore-forming bacteria EN 13704:2002 >3 99.9
Viruses EN 14476:2013 >4 99.99