Low Cost Rainwater Harvesting. For use in your WC, Its the only system with a storage Tank above ground and collecting 100% of your rain water from your roof 2500 Pounds delivered and fitted. We supply and fit Countrywide. 4 Self Build Videos + CD from planning stage to completion in detail all trades 100 Pounds including P +P Visit our website www.housebuilderguide.com an see a 1 Minute Demo. ;