Blow Moulded water tanks are made of HDPE , process by which they are formed , enables limitless design possibilities & inherent design strengths( like ribs) in water tanks. It also helps in maintaining a consistent wall thickness & super strong, virtually stress free outside corners. Multi-layered tanks offer best protection against environmental stress. It has various types such as 3, 4, 5 , 6- & 7 layer water tank which are differentiated by lifting the lid and detecting the number of edges inside the tanks.