A General Guide to Salt Mixes
Here is a list of what I measured for the big three in a number of the salt mixes we use today. This is intended as a guideline and I, in no way, guarantee these figures. All I can say is they were all tested under the same conditions, with a number of different brand test kits, using the same methods for each test. I believe these numbers are reasonably what you can expect from these salts mixed at 35 ppt or 1.0264
A special thanks to Bertoni for putting it in nice form.
Calcium
Alkalinity
Magnesium
Aquatic Gardens
430
8
1240
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
350
12
1070
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
490
7
1300
Reef Crystals
420
12
1260
Reefer's Best
420
11
1200
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
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