davem,
The EI that I use is produced by APFUK, and sold as a kit for £18.
The dosage mixed in 500ml of cooled boiled water, for the Macro is, 4tsp of Potassium Nitrate, 1tsp of Potassium phosphate and 6tsp of Magnesium sulphate. The Micro is 1tsp of Chelated trace mixed with 500ml of cooled...