You do understand Spanish has the ‘a’ sound exactly where it is in the English pronunciation. Sounds a little bit like this: “salsa”. Also, Nahuatl (pre-hispanic Aztec language) has a ‘tz’ sound that goes something like this: “ts” (Mexico is so seasoned with Nahuatl that some 40% of towns and places are named in Nahautl. Like Tenochtitlán, Texcoco)
Seltzer would sound something like this: “Seltser”
Really not the same as “Salsa”, is it?