American society of mechanical engineers (ASME) Aboveground Tank
THE COLOR OF THE TANK ALSO AFFECT THE TEMPERATURE WHILE POLYETHYLENE CAN KEEP HEAT OUT DARKER COLOURS LIKE OR DARK BLUE WILL HEAT UP THE WATER
Dark-coloured water tanks absorb more heat in the Sun, which can result in the water becoming warm or hot rather than refreshing if used for purposes such as drinking, etc. Warmer water offers a better environment for bacteria to grow and breed.