Thinking about installing an underground water tank? In this video, Callum from Graf UK explains everything you need to know from the different tank materials (concrete, plastic, fibreglass, and steel) to the benefits, installation process, maintenance tips, regulations, and costs. Whether you’re a homeowner, self-builder, or agriculturalist, underground water tanks offer a smart, sustainable way to save space, reduce water bills, and protect your property. We’ll also cover practical uses, from rainwater harvesting to stormwater management and even emergency water storage.