It depends on how you read the sentence. If, when reading, you say "A Salt-Water chlorine Generator" when you see "SWCG" then it should be "A". If you read it as "Ess - double_u - cee - gee", then it should be "An".
As for the acid.
As per: http://mw4.m-w.com/dictionary/muriatic%20acid
It is: Pronunciation: \ˌmyu̇r-ē-ˈa-tik-\
Regards,
Mark
Bookmarks