PetBharo hydroponic Institute, Bangalore training is not worth

Hello Sir,
Could you please guide on preparing nutrient solution commercially? Pl share documents so that people can make use of it

Sir, please i need help, Iā€™m growing hydroponic Tomatoes and it is showing symptoms of potassium deficiency,i think the solution is not of right balance,can you please tell me what formula should i use?
My current one is -
Npk 19-19-19
Magnesium sulphate
Calcium nitrate
Urea
Micronutrients mix