The size of your facility and your water usage will determine the size of your water storage containers. You will need multiple containers to store your water during the different phases of the filtration and sterilization process. It is important that the containers do not allow light to pass through – excess light will allow contaminants to grow. Although a tank may look opaque, it often is letting a little light through; use a strong flashlight to check that your tank is not letting any light through. If needed, heavy duty paint can be applied to the outside until there is no light coming in. Refer to the Seed Production Pathways to Scale course on the Ocean Farming Hub to learn more about how GreenWave stores and cools water. Within that course, you will also find a build list which contains links to the necessary equipment. 

The first container will hold the raw water after it is unloaded, the second container will be used for skimming and other chemical treatments, the third container will hold water that has passed through the mechanical filtration and UV and is now considered clean. From there, water can be used for seed tanks and gametophyte cultures. For a system like GreenWave’s container nursery, you need a holding tank inside the chilled area where the sterilized water can be tempered from ambient temperature to the target temperature of the grow tanks to avoid thermal shock. For a system of tanks that are chilled using a separate cooling source, use aquarium chillers.