Tristel Duo ULT


Tristel Duo ULT is chlorine dioxide in a foam, designed specifically for the high-level disinfection of endocavity ultrasound probes. Tristel Duo offers speed, safety, efficacy and excellent material compatibility.

Tristel Duo ULT incorporates two separate compartments that contain Tristel Base solution (citric acid) and Tristel Activator solution (sodium chlorite). When mixed upon pressing the foam pump, Tristel’s proprietary chlorine dioxide chemistry is generated.

Tristel Duo ULT is CE marked as a Class IIb Medical Device.

Human Papillomavirus (HPV) is a small, non-enveloped DNA virus. There are over 200 different HPV types. Types 16 and 18 are known to be responsible for approximately 70% of cervical cancer cases. A new scientific study by Meyers, et al. (2020) demonstrates that Duo ULT possesses efficacy against infectious HPV types 16 and 18 on a transvaginal ultrasound probe and a flexible nasendoscope in 30 seconds.

Microbiological Efficacy

Tristel Duo ULT is sporicidal, mycobactericidal, virucidal, fungicidal and bactericidal in 30 seconds. It has been tested in accredited laboratories worldwide and is proven effective against microorganisms of concern in ultrasound, such as:

  • Human Papillomavirus (HPV)
  • Candida albicans
  • Candida auris
  • Gardnerella vaginalis
  • Neisseria gonorrhoeae
  • Adenovirus
  • Staphylococcus aureus
  • Streptococcus agalactiae
  • Human Immunodeficiency Virus (HIV)
  • Hepatitis B Virus (HBV)
  • Herpes Simplex Virus

Duo ULT is also proven effective at denaturing DNA and RNA.

Please refer to the Resources section to view the Microbiological Efficacy Summary.


Tristel Duo ULT is designed specifically for the high-level disinfection of endocavity ultrasound probes, such as:

  • Transvaginal ultrasound probes
  • Transrectal ultrasound probes

Other uses include the high-level disinfection of non-invasive medical devices such as skin surface probes (including those used during invasive procedures) bladder scanners, transabdominal probes and blood pressure cuffs.

Product Options and Accessories

Tristel Duo ULT is available in six unique dual-compartment foam bottles per box. Each bottle contains 125ml Tristel Base solution and 125ml Tristel Activator solution. Each bottle provides 310 doses.


Duo Wipes are designed specifically to apply Tristel Duo foam evenly onto a surface to be disinfected. They are made of a non-woven material and are low-linting to reduce residue of fibres on surfaces. Duo Wipes are pre-cut to prevent shedding when dispensed from the tub. The use of Duo Wipes enhances cleaning and disinfection performance by allowing effective release of the liquid disinfectant onto the surface. Wall-brackets are available for increased ease of use.


Contact Us