Use an enzymatic cleaner for the first pass on instruments that carry blood, tissue or protein soil, and a general-purpose or neutral cleaner for loads that are mostly dust, salts or light handling soil. That is the working split in most Canadian clinics: enzymes do the chemistry that water alone cannot, because they break protein, fat and carbohydrate deposits into A general-purpose solution is lower in cost and adequate for the pre-clean of instruments that came out of a protective sleeve or that only need a rinse before sterilisation. A clinic that reprocesses surgical and dental instruments all day routinely keeps an enzymatic ultrasonic cleaning solution as its default and treats the general-purpose solution as the exception.
The comparison below covers what each type removes, how dilution and temperature change the result, and how the choice interacts with the ultrasonic unit itself.
Enzymatic vs general purpose: which solution should a clinic choose?
| Factor | Enzymatic | General purpose / neutral |
|---|---|---|
| What it removes | Blood, tissue, protein and fat soil | Dust, salts, light handling soil |
| Chemistry | Enzymes digest the soil | Surfactants lift and suspend soil |
| Contact time | Needs the time printed on the label to act | Shorter; mechanical action does more of the work |
| Temperature | Sensitive — too hot degrades the enzymes | Wider working range |
| Cost per litre of bath | Higher | Lower |
| Suits | Surgical, dental, any visibly soiled load | Presoak transfer, light soil, routine rinse aid step |
How do dilution and temperature change the comparison?
This is where the cost comparison flips. An enzymatic concentrate that is diluted to the label ratio costs more per bath than a general-purpose product, but using it at half strength to save money usually wastes the whole bath: the enzymes are below the working concentration, the bath does not clean, and the load has to be run again. Temperature is the same trap in reverse. Enzymatic solutions work in a defined band; overheating the bath to shorten the cycle destroys the enzymes and leaves you with an expensive warm bath. Follow the label, and use a thermometer rather than a hand test.
How does the choice interact with the ultrasonic unit?
The ultrasonic tank generates the cavitation that lifts soil; the solution decides what the cavitation can lift. In a general-purpose bath, a heavily soiled instrument can come out looking clean while the protein film remains. In an enzymatic bath the same load releases the film, which is why the bath then has to be changed more often — the solution is doing work, so it loads up with soil. A unit such as a digital benchtop ultrasonic cleaner with a controlled temperature and a timer lets you hold the label conditions consistently, which is the part that makes either solution reliable.
How often should the bath be changed?
Change it when it is visibly soiled, at the end of the working session, and whenever the cleaning result is questioned. A heavily used bath in a busy clinic should be changed at least once a day and more often if the load volume is high. Record the change on the instrument-processing log, along with the solution type, the dilution and the bath temperature. That record is what makes the process auditable.
Which solution should a low-volume clinic buy?
A concentrated enzymatic solution. The volume of solution used is small, the cost difference is a few cents per bath, and you remove the whole class of protein-soil failures from the process. Keep a general-purpose product only if you also run moulds, trays or non-instrument items through the bath. If you buy one, buy the enzymatic one.
What else belongs in the process?
Cleaning comes before inspection and sterilisation, and inspection after cleaning is where a missed spot is caught. Use the same sequence every time: pre-clean, ultrasonic clean at label conditions, rinse, dry, inspect, package, sterilise. In Ontario the RCDSO requires a biological indicator for each steriliser on every day it is used — daily monitoring, not weekly. The weekly baseline is the CDC / AAMI ST79 standard in most US states. Cleaning is the step that makes the rest of that sequence work, and the solution is the part of cleaning that a clinic chooses.
How should a clinic evaluate the two options before switching?
Run a controlled comparison on one load rather than a whole shelf. Split a batch of identically soiled instruments, run half through a general-purpose bath and half through an enzymatic bath at the label concentration and temperature, then inspect both after rinsing and drying. Look at hinge points, serrations and lumens, because that is where residual soil hides and where a visual check at arm’s length will not help. Record the bath temperature and the contact time for each run so the comparison is repeatable, and repeat it once on a different day to rule out a single soiled batch. If the enzymatic bath releases soil the general-purpose bath leaves behind, the cost per bath has already been answered. If both come out clean, keep the general-purpose product for that specific load and reserve the enzymatic concentrate for the soiled work.
Make it repeatable: print the compliance log templates, use the same page as your free log generator, and ask a compliance specialist when a result is unclear.
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers. Reselling? become a distributor.
Related reading
Single-use vs reusable instruments: cost and compliance · Dental sterilization compliance: ten questions · Sterilization compliance hub
Frequently Asked Questions
Should I use enzymatic or general-purpose solution in an ultrasonic cleaner?
Use enzymatic for soiled surgical and dental loads because it breaks down protein and fat. A general-purpose solution suits light soil, dust and non-instrument items.
Can I dilute enzymatic cleaner to save money?
No. Diluting below the label ratio puts the enzymes under their working concentration, the bath does not clean, and the load has to be reprocessed.
How often should ultrasonic cleaning solution be changed?
At least daily in a busy clinic, whenever it is visibly soiled, and after every session. Record the change, dilution and temperature on the processing log.
Does solution temperature matter?
Yes. Enzymatic solutions work in a defined temperature band; overheating the bath degrades the enzymes and wastes the bath.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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