1 1/2 teaspoon per gallon will give you a ppm of 1160. So start out by using about 1/2 teaspoon per gallon should give you a ppm of around 700 and slowly increase the amount as the plants mature. Up to about 2 teaspoons per gallon for flowering should give you a ppm of about 1500. Without a TDS pen it is very hard to keep track of how strong the mix is.
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