Product and Origin
Who developed EM, and when was it created?
EM (Effective Microorganisms) was developed by Professor Teruo Higa, then of the University of the Ryukyus (Faculty of Agriculture). It was commercialized in 1982 and has since been distributed with technical support worldwide.
What microorganisms are in EM•1?
EM･1 contains a symbiotic mix of beneficial, naturally occurring microbes, such as lactic acid bacteria, yeasts and phototrophic bacteria. These work together to improve microbial balance and promote fermentation.
Purchasing & Distribution
How can I become an official EM distributor?
Please contact the EM producer in your country. If there is no local producer, you may contact us directly.
Where can I purchase EM products?
EM･1® and related products are available through EM distributors worldwide. Please check availability on the Where to Buy page.
Note: Product availability may vary by country.
Usage and Shelf Life
What’s the difference between EM•1 and Activated EM•1 (AEM)?
・EM･1 is a shelf-stable concentrate containing dormant microorganisms. Its shelf life is typically 6 months to 1 year from the production date.
・Activated EM･1 (AEM) is EM･1 that has undergone a fermentation process to activate the microorganisms. It should be used within one month after preparation.
AEM is recommended for large-scale use because it reduces costs and contains highly active microbes, though the microbial composition may vary slightly depending on the fermentation conditions.
What is the shelf life of EM•1?
・Unopened: 6 months to 1 year from the production date
・Opened: Use as soon as possible (about 30 days maximum in a cool, dark place)
・Storage tip: Keep in a cool, dark place away from direct sunlight whether opened or unopened.
Note: Shelf life may vary by country . Please check with your local producer for details.
What is the usage period for Activated EM•1?
Activated EM･1 should be used within 1 month of preparation.
To maintain quality:
・Store at room temperature (roughly 20℃)
・Keep the container sealed and anaerobic (oxygen-limited)
Note: Factors such as temperature fluctuations, storage conditions, declining microbial
activity, and exposure to contaminants when opening or degassing may shorten the effective usage period.
Culturing Guidelines
Can EM•1 be reused for repeated culturing?
No. Repeated culturing disrupts the microbial balance, reducing effectiveness.
Use EM･1 only once to prepare Activated EM･1.
Will EM die in low-oxygen plastic bottles?
No. EM microorganisms include:
・Anaerobic bacteria (e.g., lactic acid bacteria, phototrophic bacteria)
・Facultative anaerobes (e.g., yeast)
Low-oxygen environments are necessary. Just avoid overfilling the bottle to prevent overflow during fermentation. Filling it up to the shoulder of the bottle is recommended.
Troubleshooting & Storage
What is the white film on the surface of Activated EM•1?
A smooth white film is usually harmless yeast. If there is no foul odor, the AEM can still be used. However, discard the solution if the film turns brown or black, or if it develops an unpleasant smell.
Can diluted Activated EM•1 be stored?
No. Once diluted, AEM should be used on the same day, as its quality deteriorates rapidly.
EM Ceramics
What are EM Ceramics and how are they used?
EM Ceramics are produced by fermenting clay with EM･1® and EM･X GOLD, then firing it at 800–1200℃. They help improve the properties of water, soil, and various materials.
Applications include:
・Water treatment: Add to pitchers or baths
・Agriculture:
– Spread EM Ceramics powder 50 kg/ha
– Mix EM Ceramics powder into AEM at 1:10,000 ratio
– Mix EM Ceramics powder into EM Bokashi at 0.1–1% of the total volumen
・Other uses: Food storage, construction, composting, and more
EM・X GOLD
How is EM･X GOLD tested for safety and quality?
EM･X GOLD is produced in a facility certified under the international food safety system FSSC 22000. Each batch undergoes strict testing, including pH analysis, sensory evaluation, chemical and sanitation checks. These processes ensure that every bottle meets the highest standards of safety and quality.
More information at the official EM・X GOLD FAQ:
Safety and Research
Is EM safe?
Yes. EM consists of safe microorganisms that are commonly used in fermented foods. Toxicity tests conducted in the U.S., EU, and Japan have confirmed that EM is safe for humans, animals, and the environment.
EM is also approved for organic use by certifications including:
· JAS (Japan)
· OMRI (USA)
· BIO-GRO (New Zealand)
· OFDC (China)
Are there scientific papers on EM?
Yes. You can find EM related academic papers here:
Support
Where can I get detailed instructions on how to use EM?
For tailored guidance, please contact the authorized EM distributor or producer in your country.
You can find contact information here:
