Freeflush design and supply rainwater harvesting systems. Our design experience has been nurtured through many years working in the water industry. The designs range from simple wall hung water butts through to large underground tanks with pumped control. We aim to make rainwater harvesting more accessible through our innovative products. Commercial Rainwater Harvesting: With the financial incentives available, there has never been a better time to consider rainwater harvesting. Show your customers that you care about the environment and resource protection. Domestic Rainwater Harvesting : We live in a world of ever depleting resources. Is it really acceptable to capture, transport, filter and chemically treat our most precious resource only to flush it down the toilet? In the UK, this is currently the fate of 30% of our drinkable water.