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1/2-1 tsp not gram same dosage as mono potassium phosphate(same product both 0-52-34). you can go to https://www.kelp4less.com/ they have a how to mix tab at home page for a whole bunch of stuff

1/2-1 teaspoon per gallon or 4 liter according to this seller of the product a teaspoon of it weighs about 5.5g