how much salt do I use

Question
I have a 25 gallon tank that I want to display a live maine lobster in.  I only need it to survive for a day or so.

I have no idea how much of this packet I should use.

Can you advise?

Answer
go get a cheap hydrometer from your fish shop, its a float device that will tell you the specific gravity of the water. the more salt the higher the SG.

the SG needs to be around 1.025-1.026 @ 25 degrees C its really the only way to tell how much to use.