FAQ

The ultrasonic cleaner introduces sound waves into a liquid. This creates tiny bubbles that immediately implode—an effect known as cavitation. The bubbles blast dirt out of even the finest crevices and surfaces—without any scrubbing at all. The result: deep-pore cleanliness in just a few minutes.

Suitable for all solid, non-porous materials: jewelry, glasses, watches, coins, tools, carburetor parts, hearing aids, prosthetics, laboratory equipment, circuit boards, razor blades, and much more. Not suitable: delicate gemstones such as opals, pearls, or coral, wood, leather, as well as painted or coated surfaces – please always check with the manufacturer.

No. Fill with water, place the item in the basket, start the device – that’s it. Models with a timer switch off automatically. For units with a heater or power control, you only need to find the setting once and then remember it. Getting started is easy even without prior technical knowledge.

That depends on the application. For jewelry, glasses, and hearing aids, we recommend distilled water – it does not leave limescale stains on sensitive surfaces. For tools, carburetors, and metal parts, tap water is perfectly sufficient and even works well, as the minerals slightly enhance cavitation. In the case of very hard water, a short degassing process is recommended before cleaning. For stubborn dirt, you should use special cleaning concentrates.

Pure water works for light soiling. For optimal results, however, we recommend one of the suitable EMAG concentrates: they reduce cleaning time by up to 80%, actively bind dirt particles, and are biodegradable. Each concentrate is tailored to specific materials – e.g., EM-080 for universal applications, EM-060 for dentures, EM-404 for aluminum and die-cast, EM-007 for weapon parts.

Rule of thumb: The larger the item you want to clean, the larger the device's basket should be. A tank capacity of 0.5–2 liters is sufficient for jewelry and glasses. For tools, engine parts, and similar items, you will need devices with a tank capacity of 3–6 liters.

You can find an overview of all series here.

HC Plus Series – The all-rounder
Heating (30–80 °C), 4-stage power regulator (40/60/80/100 %), timer up to 60 min or continuous operation – all in one. Volumes from 1.2 liters upwards. The emmi-40 HC Plus additionally offers dual frequency (20 + 40 kHz) for maximum flexibility between gentle precision cleaning and powerful heavy-duty cleaning.

H Series – Professional devices for laboratories & practices
Robust devices with a full stainless steel housing, heating, and heating power regulator. Volumes from 2 to 15 liters. Positioned for optics, laboratories, medicine, and practice use.

D Series – Solid everyday cleaners & entry into the professional segment
Reliable everyday cleaners with stainless steel tank & timer. The emmi-D25+ and above offer an entry into the professional field with heating (30-80 °C) and degas/sweep functions. Ideal for glasses, jewelry, hearing aids, and tools. Volumes from 0.45 to 28 liters.

MF Series – Multi-frequency for specialists
Devices with selectable frequency profiles, power regulation, and heating (20-80°C) for demanding applications where different materials or types of contamination are cleaned in one device. For industry, laboratories, and research.

Schalltec S Series – Compact professional devices (1.75–13 L)
Stainless steel housing, heating (20-80°C) from the S20 entry-level model upwards for the professional sector. Ideal for workshops, optics, and studios.

Bandelin Devices – Reproducible results at all times (0.9–280 L)
Professional SONOREX devices with thermostatic heating (20–80 °C), degas and sweep functions, and LED display. First choice for laboratories, dental, workshops, and industry. Volumes from 0.9 to 265 liters.

Bandelin Special Solutions – Industry & Retrofitting
Not standalone cleaning devices, but expansion components for existing systems: submersible transducers, external generators, oil separators, and filtration systems.

All EMAG cleaning concentrates are biodegradable, specially developed for use in an ultrasonic bath, and can be used in various dosages. Pure water alone cleans – but the right concentrate shortens the cleaning time by up to 80 % and protects the material.

Universal & Household

EM-090 – Universal Cleaner (included with many devices)
The entry-level choice for everyone. Suitable for glasses, jewelry, hearing aids, and everyday items. Removes general dirt, rubber, food residue, nicotine, smoke, abrasion, light anti-corrosion coatings, grease, and dust. Dosage: 3-10 %. Can be used without heating.

EM-080 – Alkaline Universal Cleaning Concentrate
Suitable for glass and optical lenses, plastics, metals including gold and silver jewelry. Dosage: 1-5 %, temperature can be chosen flexibly. The all-rounder for more demanding cleaning tasks.

Dental, Hearing Aids & Medical

EM-060 – Prosthetics Cleaner / Dental Cleaner
For dental prostheses, hearing aids, frames, and dental instruments. Removes tartar, limescale, oxides, and mineral deposits. Dosage: 3-10 %.

EM-200 – Disinfection Concentrate
For medical instruments, anesthesia equipment, endoscopes, and surgical instruments. Removes saliva, blood, tissue and bone residue, and proteins. With disinfectant effect. Dosage: according to product specifications. Disinfection and cleaning in one step.

EM-202 – Intensive Cleaner / Instrument Cleaner
For surgical instruments, medical and precision parts. Removes limescale, urinary scale, mineral deposits, rust, oxidation, tarnish, and concrete residue. Suitable for steel, cast iron, aluminum, non-ferrous metals, and plastic. Dosage: 5-15 %, 20-80 °C. After cleaning, it is essential to treat corrosion-sensitive surfaces such as gray cast iron with corrosion protection (oil or wax).

Metal Parts & Workshop

EM-100 – Deoxidizer
Specially designed for the removal of oxides, sulfides, and flux residues. Suitable for bronze, precious metals, copper, brass, art objects, coins, and jewelry. Not suitable for gold-plated or silver-plated parts, jewelry with artificial oxidation, or jewelry with pearls, coral, amber, or soft gemstones. Ready to use without dilution. Perform cleaning only in glass or plastic containers.

EM-300 – Metal Cleaner
For steel, stainless steel, brass, copper, and precious metals. Not suitable for aluminum. Removes oils, grease, dust, abrasion, dirt, and general deposits. Dosage: 1-3 %, temperature freely selectable.

EM-700 – Non-Ferrous Metal Cleaner
Specially for copper, brass, bronze, non-ferrous metals, jewelry, watch parts, and casings. Removes light contamination and oxidation. Dosage: 5 %, 20-80 °C.

EM-800 – Workshop Cleaner
For tools, metal parts, and general workshop applications. Removes oils, grease, lubricants, coking, scale, dust, fingerprints, and soot. Suitable for stainless steel, non-ferrous metals, brass, and plastic. Not suitable for aluminum. Dosage: 3–10 %, up to 30 °C.

EM-900 – Extreme Cleaner
For particularly heavy contamination such as coking, heavy greases, synthetic oils, crude oil, tar, and bitumen. Suitable for aluminum, non-ferrous metals, metal, steel, and stainless steel. Dosage: 5–20 %, temperature can be used flexibly.

Aluminum & Die-Cast

EM-404 – Aluminum and Die-Cast Cleaner
Specially for aluminum, light metal, carburetors, engine blocks, and die-cast parts. Removes oils, grease, oxides, polishing residues, combustion residues, and mineral residues. Dosage: 1–5 %, 50-60 °C.

Electronics & Circuit Boards

EM-303 – Circuit Board and PCB Cleaner
For circuit boards, printed circuit boards, and electronic components. Removes flux, unused solder paste, resin, and pigment residues. Dosage: 10 %, 60-70 °C. Only suitable for robust, undamaged electronic components.

EM-600 – Special Cleaner
Suitable for glass, rubber, ceramics, plastic, and metal. Removes paint mist, grease, oils, pigments, and wax. Not suitable for light metal, tin, and zinc. Dosage: 1-10 %, 20 - 80 °C.

Weapon Parts & Hunting

EM-007 – Special Concentrate for Weapon Parts
Developed for steel, precious metals, frames, ball bearings, brass, stainless steel, and weapon and precision parts. Removes powder residue, oil, grease, rust, and deposits. Anti-corrosion effect after cleaning. Dosage: 1-3 %.

All concentrates are available in our shop under Cleaning Concentrates. If you are unsure, our service team will be happy to help: Mon–Fri 8:30 am – 5:00 pm at +49 (0) 6105 / 40 67 00.

Frequency and power controllers are two different things: The frequency determines the type of bubbles (fine or vigorous). The power controller determines how intensely the ultrasound operates – from 40% (gentle) to 100% (maximum power). The HC Plus devices have 4 levels: 40 / 60 / 80 / 100%. Delicate items such as spectacle lenses or hearing aids: 40–60%. Heavily soiled metal parts: 80–100%. You can combine both functions to achieve the exact right result.

Dual-frequency means the device can choose between two cleaning modes. At 40 kHz, fine, small bubbles are created – ideal for delicate items like glasses or jewelry. At 20 kHz, larger, more powerful bubbles are created – ideal for heavy soiling such as oil, grease, or rust on metal parts. The emmi-40 HC Plus is currently the only device in our range with this feature. You select the frequency directly on the device – no technical expertise required.

40–60 °C is ideal – this is where most cleaning concentrates are at their most effective. Ultrasonic cleaners are not kettles: for units with a capacity of 0.8–6 L, it takes approx. 30–40 min to reach 50 °C at room temperature, and approx. 45–60 min for larger units (8.5–13 L). Tip: switch the device on and let it heat up while you prepare the parts.

Generally between 3 and 15 minutes. For glasses and hearing aids, 30 seconds is usually sufficient. For heavily soiled tools or carburetor parts, 15–40 minutes may be necessary. With the right concentrate and the appropriate temperature, results are often visible much faster.

Coarse dirt and food residues should be removed beforehand – this protects the cleaning solution and improves the result. For oil or grease deposits on metal parts, a quick manual pre-wipe is advisable. The actual deep cleaning is then performed by the ultrasonic bath.

Yes: Always rinse parts with clear water and dry them completely. Afterwards, protect metal parts (tools, weapon parts) with a thin film of oil. Gently polish glasses and spectacle frames dry. Thoroughly rinse hearing aids and prostheses as well.

After each use, empty the cleaning solution, rinse the tank with clear water, and store it dry. Deposits on the bottom of the tank reduce performance – if visible residue forms, wipe it out briefly with water and a soft cloth. Never operate the device empty (without liquid) – this will damage the ultrasonic tank.

Freshly filled water contains dissolved air bubbles, which weaken cavitation. Degassing means letting the device run briefly without any items to be cleaned (approx. 2–5 minutes) until the water appears clear and still. After that, the ultrasound works optimally. This is especially recommended for hard tap water.

For faster and more efficient cleaning, it is recommended to purchase a device with a degas function. This eliminates the need for a manual degassing process.

As soon as the liquid is visibly soiled or the cleaning result declines. For household use with occasional cleaning, one bath lasts for several cycles. In a workshop or studio, a daily change is recommended. Tip: Never use the same bath for different material types (e.g., jewelry and metal parts) – this quickly contaminates the solution.

Under no circumstances may flammable liquids (petrol, alcohol, solvents) be used undiluted – fire hazard! Also prohibited: chlorofluorocarbons and fluorocarbons. Do not use household cleaners, acids, or chloride-containing substances – these will damage the stainless steel tank. Only use suitable cleaning concentrates in accordance with the product instructions.

Only to a limited extent. Electronic components must not be placed in a water bath. Circuit boards can be cleaned with the EM-303 concentrate and special procedures. Robust, waterproof housing parts are not a problem.

The ultrasound itself is in the 20–45 kHz range and is imperceptible to the human ear. What you hear is a hissing sound caused by cavitation – this is completely normal and harmless. The included lid muffles this noise.