There are some kids that have been declared SV but then later given florinef because they were not growing too well and their renin levels were out, and I think it is possible to have the salt wasting to a slight degree that it does actually need treatment in some cases, but it takes a while to show up in the bloods and the growth.

That’s me.   Sort of.  My renin levels are slightly out so I take a small amount of florinef per day.  Helps keep them under control.  Also makes me sweat a lot.  :p