The 3 layer green water tanks are tanks that are specifically designed to store green water. Green water is water that has been treated with ozone, ultraviolet light, or other technologies to remove harmful organisms, such as bacteria and viruses. The tanks are made up of three layers: an inner layer, a middle layer, and an outer layer. The inner layer is typically made of a food-grade, non-corrosive material such as stainless steel. The middle layer is typically made of a flexible material that is resistant to puncture and wear, such as a plastic-coated fabric. The outer layer is typically made of a durable, weather-resistant material such as PVC or HDPE. The 3-layer structure of these tanks allows for increased durability, safety, and longevity.