The WaterFarm� 8-pack is eight WaterFarm� module units connected to one Controller, an integrated 13 gallon reservoir and an 8 gallon controller unit. The Controller will keep each unit topped off with the correct level of nutrients for low maintenance. The kit is powered by GH�s Dual Diaphragm Air Pump and includes all the necessary hardware, supplies and Flora Series nutrients. The grower can arrange the WaterFarm� units in a design that is suitable for any environment. This system does not include clay pebbles.