There are a lot of remineralizers out there....
Salty Shrimp
SL-Aqua
Vin
Shrimp Nature
Lowkeys
Salty Bee
Borneowild
Brightwell Aquatics
Dennerle/Shrimp King
GlasGarten
Aquavitro (Seachem)
Some people use minerals that are not designed for shrimp.... some of these result in "dirtier" water (that is, higher TDS compared to GH/KH)
Seachem Equilibrium
Kent R/O Right
Nutrafin African Cichlid Conditioner
I do see Mosura Mineral Plus Ultra for sale? But does not seem to be an ideal GH remineralizer?
In short, there are A LOT of options out there.
Powder remineralizers will be more bang for the buck, thus lasting longer.
However, liquid remineralizers may have more 'ingredients' in them that may be beneficial to shrimp - plus faster mixing rates
Salty Shrimp is a common and popular product as it's one of the cheaper options AND easily available. I've used Salty Shrimp before although currently am using Aqualex (SL-Aqua).
Make sure that whatever shrimp you decide to keep, you get the appropriate minerals and tank setup for them... i.e. inert substrate, you want GH and KH minerals. Depending on brand, you may be able to purchase an "all in one" product, or you may need to purchase them separately.
If you go with active substrate that lowers the pH of the water, make sure you get a GH only remineralizer.