Growing aquaponically means that you depend heavily on water, and in building your own aquaponics system, the source water is one crucial consideration that you need to consider. It is because water is the lifeblood of an aquaponics system. Through water, all the essential nutrients are transported to the plants, and it is also the medium through which fish receive oxygen. However, not all water is equal; water can have different oxygen levels, be treated with chemicals, or be contaminated.