Standard stock solutions are typically 1:100 which is 100g of dry chem in 1L of distilled/ro water so for every 10ml you have 1g of dry chem. You can also make the stocks custom which will allow you to use equal amounts. You will have to do a test to see if the mag sulphate (epsom) reacts with the jack`s in a concentrated solution, if it does you`ll need to make it a 3-part.