01924 495 975

How to Perform a Foil Test in an Ultrasonic Cleaning Bath

For friendly & knowledgable help contact us on:
01924 495 975     hello@sonicsolutionsltd.com     Open Contact Form

How to Perform a Foil Test in an Ultrasonic Cleaning Bath

When a customer asks us how they can check the performance of their ultrasonic tank, the easiest way to do it is through a foil test.

It is really easy to do and all you need is a piece of aluminium kitchen foil and your ultrasonic tank!

Firstly you want to fill your tank with clean mains water with no chemical in. A lot of ultrasonic chemicals will react with aluminium, especially thin foil.

Next you want to take a small square of aluminium foil, 10㎠ should do it.

Then, using gloves, you need to hold the foil under the solution for 30 seconds. While doing this, try to keep the foil straight and avoid it curling in on itself as this will not give the required results.

Next you want to hold the foil up to a light and see the results.

Good result

If the ultrasonic bath is working effectively then what you should see is an even covering of pinprick holes throughout the foil. The holes should be relatively uniform in size and be evenly distributed.

Bad result

If the ultrasonics are not working correctly you may see little or no holes on the foil. This would indicate that some or all of the transducers are no longer working.

Patchy holes

Another result you may see is large holes on some parts of the foil and little to no holes on other parts. This is caused by there being an ineffective or missing sweep frequency. This results in “Hotspots” of ultrasonic activity which can seriously damage your parts if not fixed.


For the best results, repeat this test in different parts of the tank to make sure there is consistency throughout. The larger the tank, the more tests should be carried out.

For a free trial clean, a no-obligation discussion, or even a visit when the current situation permits, just call us on 01924 495 975 or e-mail Toby on toby@sonicsolutionsltd.com

Contact us

Click onPress the button to open our enquiry form and we’ll come back to you ASAP (usually within the hour) with answers, options, prices and services or call us today on 01924 495 975

Our Clients

What Our Customers Say About us


We approached Sonic Solutions after our parts manufacturers let us down and wasted precious time by supplying oily parts. Not only were they friendly, helpful and happy to rush our parts through - the quality was unbelievable! They arrived back at our factory just in time to not hold up production and we couldn't recommend them highly enough.

Martin Frings


Our company AssetCool found the entire team at Sonic Solutions to be responsive and incredibly supportive of a new project. Their technical knowledge is superb, and they delivered exactly what they promised. We're very happy to recommend them to anyone with ultrasonic cleaning needs, and look forward to working with them again in the future.

Tonia Parris


I reached out with a problem to various companies prior to talking with Sonic Solutions, most were unhelpful. These guys insisted on the first trial being for free! The job was excellent and the turn around time very impressive. We are now setting up a monthly cleaning regime with them. A joy to deal with.

Andy Sim


Don’t Spend Another Penny on Replacing or Cleaning Parts Until You’ve Asked These 7 Critical Questions.

Asking These Questions Saved One Customer over £70,000 a Year, Seriously!

What Cleaning Process Do I Need? A Quick & Easy Reference Guide...

Use this quick reference guide to compare parts vs contaminants to shortlist possible cleaning processes (Ultrasonics vs Pyrolysis vs Jet Wash vs Vapour Blast vs Soak)

The Ultimate Guide to Industrial Ultrasonic Cleaning

Get a complete understanding of the underlying science, equipment and characteristics of ultrasonic cleaning.