Did the math for reef crystals, since that is what I use. here's the computations:
Reef crystals instructions say to use 1/2 cup of salt per gallon. that works out to 114.96 grams(1/2 cup) of salt for 3,785.41ML (1 us gallon) divide both by 10 to scale down, and you get 11.49 grams of salt for each 378.5 ML of water. scaling that down for 7 grams of salt, comes out to 230 ml of water. Since they used less water than the reef crystals manufacturer recommends, then in my mind, that means that the values they published are actually a bit on the high side from real world results. That just sucks. What it really boils down to, is that since the salt product yields lower than expected results, then consumers have to use higher concentrations of it to get good results, which means the stuff doesn't last as long as it should. Seems like a benefit to the manufacturers as it probably lowers cost of production, and increases demand. That's just downright shady.
:( :(