#T16,534 - Earl Herald photograph, November 18, 1948.

Unidentified Steinhart Aquarium staff member cleaning water filters deep within the Aquarium, underneath the floor housing the aquatic displays. Engineering and physical plant maintenance has always been a big part of keeping tanks clean and healthy for their inhabitants.

This image was scanned from an original photo in the files of the California Academy of Sciences Archives. Written permission is required for reproduction or publication, including additional Web use.