This thread contains data gathered by member Billybeau1 and hilgert. Thanks!
Here is a list of what they measured for the big three in a number of the salt mixes we use today. This is intended as a guideline only. These numbers should be what you can expect from these salts mixed at 35 ppt or SG 1.0264 @ 25 C.
Salt Product | Calcium | Alkalinity | Magnesium |
Aquatic Gardens | 430 | 8 | 1240 |
Brightwell Neomarine | 370 | 11 | 1140 |
CoraLife | 560 | 9 | 1380 |
Crystal Sea Marinemix | 340 | 9 | 1050 |
Crystal Sea Marinemix Bio-Assay | 340 | 9 | 1050 |
D-D H2Ocean | 450 | 10 | 1380 |
Instant Ocean | 400 | 11 | 1350 |
Kent | 540 | 11 | 1200 |
Marine Environment | 480 | 7.5 | 1450 |
Oceanic | 580 | 8.5 | 1650 |
OceanPure | 510 | 10 | 1320 |
Red Sea | 400 | 8 | 1300 |
Red Sea Coral Pro | 470 | 12.5 | 1400 |
Reef Crystals | 490 | 13 | 1440 |
Reefer's Best | 420 | 11 | 1200 |
SeaChem aquavitro salinity | 422 | 9.8 | 1336 |
SeaChem Marine Salt | 500 | 10 | 1400 |
SeaChem Reef Salt | 540 | 10 | 1450 |
Tropic Marin | 375 | 10 | 1230 |
Tropic Marin Pro Reef | 450 | 8.5 | 1380 |
Tunze Reef Salt | 420 | 9.5 | 1350 |