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I meant a 1/4 tsp...brain smog1

Hi I need some help in this area too! When adding epsom salts to bubbleponic system... do I add 1/2 tsp. per gallon in the tote itself? I use 18 gallon tote. Do I add 4.5 tsp. directly? I will mix foilar feed and do that until I verify! Thanks!