marine salts

[BCOrchidGuy]

Copper in that quantity would work out to .156 ppm

((2.4mm/k x molar mass of copper 63.55g)/1000) x SG of test water 1.023 = a copper concentration of 0.156 ppm

Yes you are right Kent salt has more copper, am I worried? no, I think if your salt is consistant from batch to batch that is your biggest worry. If you want to change salt because of that then go ahead. I think though that it is an extreme measure. I would rather have a salt that mixes pH, Ca and Alk wise the same batch to batch. What will you do if you get a batch of salt that has a massive dose of copper..... I personally know two people who have used BioSea/Marine Environment on and off over the years, they both keep saying they will never go back but they do, they have complained about low pH (7.5) Hi pH (9.6) and Ca and Alk levels that leave them scratching their heads..... they change salts... their coral closes up... so they go back to the one they love to hate.