 Vertical Water Tank Double-Layer. Exterior black layer for resistance and UV protection, interior light blue layer for easy viewing of water level and condition. On 2,500 and 5,000 capacity lid is conveniently placed on the side. |  Horizontal Water Tank Double-Layer. Exterior black layer for resistance and UV protection, interior light blue layer for easy viewing of water level and condition. Available in 700 and 1000 liters capacity. |  Silver Triple-Layer Water Tank Triple-Layer for more resistance. Exterior Silver color layer blends well with the environment, Black middle layer provides UV protection, and light blue interior layer allows easy viewing of water condition. |