An installation and care guide -- see page 7 for care of hydro massage system (circulating water)- <a href="http://www.homelivingsolutions.com/HLS_installation.pdf">http://www.homelivingsolutions.com/HLS_installation.pdf</a> Note: (Regular Cleaning section 5): Reason for regular cleaning is to remove body and bath oils, soap residue and other sources that can contribute to bacterial growth in the hydro massage system.