FloraFlex has engineered the highest quality, cleanest and most pH stable nutrients on the market. B1 and B2 combine as a two part water soluble formula, providing all of the essential nutrients needed for vigorous plant growth throughout the entire flowering stage. Use 1-3 teaspoons per 5 gallons of water (1-2 grams per gallon). Add B1 and then B2 to your water source throughout the entire flowering stage. For optimal results make sure the EC of your water is 0.2-0.3. The EC of your water can range up to, but should not exceed 0.7. At lower dosages B1 and B2 can be used as a base along with other additives.