there seems to be controversy on this. you know how people say you should slowly add the salt to a bucket of RO/DI with a powerhead already swriling & never the other way around, basically you just added a tiny amount of water to a full bucket of salt.
there are concerns that certain ions formed salts (positive + negative charge) and these are so strongly ionically bonded that they will not go back into solution if you add more water? perhaps the trace minerals? this is especially true with the main buffer: sodium bicarbonate. some people believe that it will be hard to redisolve this to an acceptable dKH.
if you can spare a lot of RO/DI & have a big enough container, find out for yourself. just use the entire bucket of salt in the advertised volume of RO/DI. I woulnd break off chunks for partial use as the salt tends to settle out and become non-homegous during sitting. *IF* the salt fully dissolves, test params...
personally this has happened to me 3 times with 200g buckets of Tropic Marin regular & I used the whole bucket, tested OK, had no issues with coral. then again, another bucket of D&D is relatively cheap compared to coral.