The basics (Terra A & Terra B, Hydro A & Hydro B) are used to get the main part of the diet to the plants. They can be seen as the bulk feed of the plants. The nutrient enhancers (Rhizo Root Stimulator, Bloom Accelerator and Final Boost) are products that will push the balance of the diet to a specific side of the spectrum. They are generally used to boost processes in specific phases in the life cycle.