DIAZYME 4X is something special that can convert 100% of the maltose sugars to glucose which would make all of the sugars fermentable by the yeast. AG-300 should be pitched with the yeast and operates in the most cost effective manner at fermentation temperatures. It gets the whole job done!
USAGE: Add 10 to 25 drops per 5 gallons of mash at or near the start of fermentation. Twenty drops, around 1/4 teaspoon ought to do it. Stir it in good, and stir before pitching yeast. Do not use above 140f, the product will denature. Generally add and stir well as the temperature cools to below 140f and conversion will be complete by the time you are down fermentation temp and ready to pitch the yeast. We reckon there are 20 drops per ml so that would be approx 10,000 drops in 500ml so one bottle can do 400-500 gallons.