Hydroponic Research DOS A Base Two Part Powder Nutrient, 25 lb.As Simple as A+B More concentrated. A better price point. Already the cleanest, most stable nutrient, today's DOS makes every part of your grow even easier. A 1: 1 Ratio Keeps it Simple 1 lb of powder to 1 gal of water. Easy to mix. Easy to manage. The Stable Solution Precise PH control, compatible with all mediums. Amplify Growth Add Stackswell (STAX) to stimulate vegetation. Add SHINE to enhance terpene production. Flexible Formula Allows for