Dear Sirs,

We need rock salt for refinery industry. The year demand is 
about 20.000mt. the specs i need is the follow:
Ca++ maximum 0,12%
Mg++ maximum 0,03%
Ca: Mg minimum 10
So4  maximum 0,25%
Non destroyed parts in the water maximum 0,15%

Nacl in dry      minimum 99,00%
I look forward to having your specs and a fob price at your 
nearest sea port 
Best regards