It is our pleasure to inform you that as of Jan 1, 2010, GSL began marketing our OMRI listed sulphate of potash (SOP) products under the brand name, "organic K⁺."

GSL's sulfate of potash has been accepted for use in organic farming in the United States for more than 30 years. It is used by itself as a potash fertilizer and as an ingredient in many formulated brands of organic fertilizers.