Grumpyb Water Tanks supply Rain Water Tanks Australia wide. Whether you need a single water tank or several water tanks we offer you the best prices and service. We specialise in water tanks, water pumps and rainwater harvesting accessories and only sell High Quality, Food-Grade Rain Water Tanks. We can offer the best prices for Water Tanks because we are volume sellers and the savings you can make on your Water Tank are a product of our great purchasing power.