how a salt dissolves (grit/residue at the bottom of the bucket)has very little to do with the constituent properties of the water it makes/ i always get a chuckle from how companies use that for marketing ploy
red sea always left a small amount of sediment residue in the bucket-and i've spawned and raised damsels with it
the original red sea salt, and crystal sea by mei are the only two salts i've found via long term seperate batch testing to live up to the box claims, and to have consistent good Ca and Mag levels-i've used crystal sea exclusively at work (retail and import/wholesale) and at home for the past 5 years or so
almost any major brand salt will keep a tank healthy and happy, though-99% of the 'problems with a salt mix' are more likely 'user error' than the all too commonly used 'scapegoat salt excuse' that hobbyists use when something is amiss with their tank-and ron shimek's armchair science salt study did little to quiet all the bs hype surrounding salt mixes
damsels/clowns were spawning in home made salt mixes in the '60's using recipes that were quite abit more 'primitive' than the manufacturing processes of today (e.g.-the monaco formula)
i've seen hobbyists swear on a stack of biblesthat a salt is garbage,and is the reason their tank is going south, while using a cheapo swing arm hydrometer that was off a full 5 thousandths of a point on SG!
:lol: