Decontamination is the part of a clinic or lab setup that people underestimate, then have to fix in a hurry. It is also an area where the words get used loosely: cleaning, disinfection and sterilisation are three different things, and equipment that does one does not necessarily do another.
Here is the plain version, and what the used market looks like.
Cleaning vs disinfection vs sterilisation
- Cleaning removes visible soil and organic matter. Nothing else works properly until this has happened — you cannot disinfect through a layer of dried blood.
- Disinfection reduces the number of viable organisms to a safe level. It does not necessarily kill spores.
- Sterilisation destroys all viable organisms including spores. In practice this means an autoclave and validated cycles.
A washer-disinfector does the first two. An ultrasonic cleaner does the first. UV-C does surface disinfection only. None of them replaces an autoclave for instruments that enter sterile tissue.
Ultrasonic cleaners
Cavitation in a liquid bath lifts soil out of hinges, serrations and lumens that a brush cannot reach. This is the first stage for surgical and dental instruments, and it is the cheapest useful thing you can add to a decontamination bench.
In stock: VWR USC-T benchtop ultrasonic cleaner — £450.
What to check used: heater function if the model has one, transducer performance (a foil test is the standard check), and tank condition — pitting in the tank base is a sign of a hard life.
Washer-disinfectors
The workhorse of any instrument reprocessing room. Automated cycle, thermal disinfection, documented and repeatable. Considerably more expensive than an ultrasonic bath, and considerably more capable.
In stock: Prestige Medical UltraClean 3 washer-disinfector — £2,100.
What to check used: door seal condition, pump and drain function, whether the cycle printer or data logging is present and working, and water supply requirements — some models need softened or RO water and will scale up quickly without it.
UV-C decontamination chambers
Surface disinfection using ultraviolet light. Useful for items that cannot be wetted or heated — electronics, some plastics, packaging. Shadowed surfaces do not get treated, so it complements rather than replaces wet processes.
In stock: Once Model 24-0200 UV-C decontamination chamber — £1,950.
What to check used: lamp hours and whether replacement lamps are still available, interlock function on the door, and whether the timer is accurate.
Water quality is the thing people forget
Washer-disinfectors and autoclaves both live or die on feed water. Hard water scales heaters and blocks jets, and it is the single most common reason a second-hand unit underperforms. If you are setting up a new room, cost in water treatment from the start.
In stock: ELGA PureLab Option-Q LA621 water purification system.
What you should expect to pay
- Benchtop ultrasonic cleaner: £150–£600
- UV-C chamber: £800–£2,000
- Washer-disinfector: £1,500–£4,000
- Lab water purification system: £600–£2,500
An honest word on validation
We sell decontamination equipment as working machines, not as validated systems. If you are reprocessing instruments for clinical use, the validation, periodic testing and record-keeping are your responsibility under your local policy — whoever you buy the machine from. We will tell you what we tested and what we did not, and we will not claim a cycle is validated when it has not been.