If you are thinking of harvesting the rain that you see run into the ground when it rains, you have already made a positive step towards redressing the situation, and with the current trend for eco-friendly practices, it does highlight the waste, especially if you happen to live in a dry region. Modern rain harvesting systems incorporate state-of-the-art steel water tanks, and with a range of sizes, from a small 4 metre diameter unit that would hold just over 25,000 litres, to a tank that can accommodate a whopping 275,000 litres, and with multiple units, you can really take advantage…