Rainwater HOG is a modular water storage tank which can be used horizontally or vertically for Rainwater Harvesting, emergency water storage and post-filter greywater storage. Rainwater HOG was named a USA Top-10 Green Building Product in 2008 [1] and won a Spark Design Award [2] and two additional sustainable product awards, a California Home & Design award [3] and a Green Log Award [4] in 2009.