Hydroponic nutrients for off grid grow boxes. Mix with 5 gallons of water. This is the formula I have used for 5 years. It is what I used to grow a majority of the plants in my videos.
10 grams Masterblend tomato formula 4-18-38
10 grams Green Biotech Inc Ammonium Calcium Nitrate 15.0-0-0
5 grams Epsom salt