| The members of SOPIB are the main producers of sulphate of potash. The Board of Directors is in charge of strategy, while the Agronomic Committee proposes research programmes, communications topics and budgets. |
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| Great Salt Lake Minerals Corporation |
 Great Salt Lake Minerals Corporation, as the largest producer of Sulfate of Potash in North America, uses a manufacturing process acitvated by solar evaporation, to produce natural and organic mineral products approved by many organic grower organizations. The Great Salt Lake is the largest source of SOP in North America. |
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K+S KALI GmbH
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 K+S KALI GmbH is the leading supplier of potassium sulphate and
magnesium and the 4th largest producer of potassium worldwide. With
production locations all over Europe and distribution locations all
over the world, K+S KALI GmbH is able to provide its clients with a
wide variety of products for specific customer needs. |
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Tessenderlo Chemie |
 Tessenderlo Chemie is the second largest producer of potassium sulphate worldwide and exports its products to more than 80 countries. |
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SQM |
 Located close to the Atacama Salt Desert, SQM has exclusive access to the greatest potassium concentrations ever known and to significant
sulphate accumulations. Especially customers in South America benefit
from this resource. |
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