Aquae Sulis a major Roman Baths complex associated with an adjoining temple. About 130 messages to Sulis scratched onto lead curse tablets ("defixiones") have been recovered from the Sacred Spring by archaeologists. Most of them were written in Latin, although one discovered was in Brythonic, and usually laid curses upon those whom the writer felt had done them wrong. This collection is the most important found in Britain. The Brythonic curse recovered on a metal pendant is the only sentence in the language that has been discovered. It reads: "Adixoui Deuina Deieda Andagin Uindiorix cuamenai" or maybe "Adixoui Deiana Deieda Andagin Uindiorix
Aphanizomenon flos-aquae toxic chemicals released when cells die. Once released (lysed), and ingested, these toxins can damage liver and nerve tissues in mammals. In areas where water quality is not closely monitored, the World Health Organization has assessed toxic algae as a health risk, citing the production of anatoxin-a, saxitoxins, and cylindrospermopsin. Dogs have been reported to have become ill or have fatal reactions after swimming in rivers and lakes containing toxic "A. flos-aquae". Microcystin toxin has been found in all 16 samples of "A. flos-aquae" products sold as food supplements in Germany and Switzerland, originating from Lake Klamath: 10 of 16