Water Quality in the Ornamental Aquatic Industry OFI Educational series 1 The author, Roberto R. Hensen, discussed water quality standards and how to maintain these standards in practical situations. In short, a very useful tool for every company active within the ornamental aquatic industry. With this 64-page book in A5 format (including many colour photos), OFI aims to contribute to the improvement of the general level of water quality in the entire ornamental aquatic industry. . ISBN: 978-90-75352-64-1