The Living Machine has come a long way. Shown here is one of the interior planters of the Living Machine blackwater treatment system located in the lobby of the San Francisco Public Utilities Commission Headquarters. (Photo by Mignon O’Young)

The Living Machine has come a long way. Shown here is one of the interior planters of the Living Machine blackwater treatment system located in the lobby of the San Francisco Public Utilities Commission Headquarters. (Photo by Mignon O’Young)

The Living Machine has come a long way. Shown here is one of the interior planters of the Living Machine blackwater treatment system located in the lobby of the San Francisco Public Utilities Commission Headquarters. (Photo by Mignon O’Young)