This kit has what you need to get your hydroponic system started. Includes one 1 Liter bottle of each A & B plus a bottle of Roots Excelurator Gold to get your plants going. Aqua Flakes® A & B provides the highest quality, fully soluble nutrients designed specifically for recirculating hydroponic applications. Provides perfect base nutrition for ebb and flow, Deep Water Cloner, aeroponics or any type of rockwool. Also use Aqua Flakes® in inert peat mixes for best results.