One 20kg batch of Stock Solution is concentrated enough top make up over 3,100 gallons of Working Solution, at 20 CF (2.0 EC)
36 mls of Part A plus
36 mls of Part B plus
1 Gallon of water equals
1 Gallon of Working Solution at 20 CF (2.0 EC)
Stock Solution - Concentrated solution made after mixing dry minerals with water. This is the mixture you pull from to make your working solution. The 20kg batch fills two 30-gallon buckets, making 60 gallons of stock solution.
Working Solution - The solution in your main reservoir that your plants are using to grow. Water, pH adjuster and stock solution, make up your working solution.