Выражение встречается в следующем контексте:Why do I experience sloughing after using the toothpaste?
The low water formulation of SPA can lead to desquamation. This is a natural process and not a safety issue.

Заранее спасибо

http://acronyms.thefreedictionary.com/Sanum+Per+Aqua+(Latin:+Health+Through+Water)