Frequently Asked Questions


Payment & Delivery

Online purchase support

For bulk orders(more than 100), 30% deposit before production, the balance before shipment.

for bench-top ones, usually we have it in stock. So we could ship it in 3 days if the quantity is less than 100pcs. If quantity is bigger than 100pcs, welcome to consult us about the production time. For industrial ultrasonic cleaners, it takes about 7-15 working days to produce.

we welcome customers to do ODM, OEM, wholesale and customization.For ODM and OEM, a brand authorization letter from your side is needed.

About Ultrasonic Cleaning

Accordion Content

While we use the term ultrasonic cleaner these devices do a lot more than clean parts, be they engine components, injection molds or surgical implants. For example, they are used to degas solvents, disperse nanoparticles, and emulsify, dissolve, disperse and otherwise prepare lab samples.

Most ultrasonic cleaners operate between 35 and 45 kHz. This frequency range is well suited to the vast majority of cleaning tasks.

A lower frequency such as 25 kHz produces larger cavitation bubbles. When these bubbles implode they release a stronger cleaning energy. For coarse cleaning such as removal of lapping abrasives or polishing paste, a lower frequency will be more effective.

Note that the lower the frequency, the louder the cleaning operation due to tank wall vibrations. Lids (which also reduce evaporation), sound-deadening enclosures and ear protection are ways to reduce annoying ultrasonic noise.

A higher frequency produces smaller cavitation bubbles. These cover fine featured complex surfaces more thoroughly and are gentler than low frequencies. For fine cleaning of very delicate jewelry, electronics, and soft metals with polished surfaces consider a unit operating at 80 – 130 kHz. If you are cleaning capillary tubes or spectrophotometer cuvettes you will need a unit that operates at 80 kHz or higher.

If you are cleaning a variety of materials consider dual-frequency ultrasonic cleaners available from Granbosonic.

Measure the dimensions of largest parts to be cleaned and make sure to select a tank that will accommodate these parts. In addition, pay attention to the internal dimensions of the parts

Most cleaning operations are much more effective with heating. A heated cleaning solution is best for removing oils, machining coolants and a whole host of other contaminants from just about any surface you can think of.

Although heat is a natural byproduct of ultrasonic cavitation, cleaning efficiency increases when you give it a boost by using ultrasonic cleaners with thermostat-controlled heaters. These can be adjusted in increments to 80⁰C above which cavitation is inhibited and cleaning efficiency levels off.

On the other hand if you are removing blood, don’t use heat at all.

Quality & Service

All our products are under CE, FCC, KC,ISO,regulations and compliance to RoHs, REACH.

We put every machine through a series of rigorous tests, to ensure that it meets or exceeds our rigid standards, which are the most stringent in the industry. Every new Granbo machine is accompanied by the Quality Assurance Program seal, assuring you that it is worthy of the Granbo name. Our research and development team continuously seeks new and innovative ways to maximize the effectiveness of our machines, solutions and accessories, so we may provide you with the best product possible. Our goal is to remain in the forefront of the industry, by further advancing ultrasonic technology. The Granbo Quality Assurance Program and Research and Development effort are ways in which Granbo works harder to remain your choice for reliable, quality Ultrasonic Cleaning Systems.

12 months warranty for Granbo ultrasonic cleaner. Any technical problem during warranty time, free replacement parts will be sent to your door. And technical support is also available after 1 year.

All returns must be authorized by Granbo in writing. We do not refund the original shipping charge. Items sold with ‘free shipping’ will be subject to a $15 shipping and handling fee. The return should be shipped freight prepaid and insured for the full value of the merchandise to the address issued with the authorization number. An item returned for any reason other than what is covered under warranty will be subject to a 20% restocking charge. All items must be returned within 15 days of receipt of your order in complete, unused, and re-sellable condition to receive credit. Product returns after 15 days from receipt may be subject to charges greater than 20%. If, however, the return is damaged (including in-transit damage), used, or contaminated beyond reuse, then Customer is liable for up to the full amount of the order. Charges for damaged or used products will be determined solely by Granbo . No returns will be accepted after 30 days.


While ultrasonic cleaning systems will work with plain water, adding a mild detergent can often speed up the cleaning action. Delicate parts such as semiconductor wafers, printed circuit boards and some medical devices might be damaged by using detergents, so in these applications cleaning with DI water is recommended.

There is no set amount of time or “typical” cleaning cycle. How soiled the part is, the temperature of the tank, how clean the part is to be, and the condition of the ultrasonic cleaning solution all contribute to the length of the cleaning cycle. An experienced operator may be able to approximate the time required to clean an object, ultimately however, an inspection is required to determine if the desired state of clean has been obtained.

Degassing is the initial removal of gases from your cleaning solution. You can’t get any cleaning done until you degas, because all the energy is being used to drive the gases out of the water. You should degas every time you put fresh cleaning solution into your tank. Normally just running the ultrasonics for 5 minutes will do the trick.

The solution level should always be maintained at the level indicator in the tank, with trays or beakers installed. The ultrasonic cleaning system is a ‘tuned’ system. Improper solution levels will change the characteristics of the environment, can affect the system frequency, decrease effectiveness, and potentially damage the cleaner. Maintaining the proper solution level provides optimum circulation of solution around parts, and protects heaters and transducers from overheating or stress.

Still have more doubts? Then why not contact us directly.

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