This is for maintaining cal, mag and alk levels. It should never be used to raise cal, alk or mag alone. It's like Tropic Marin Bio-Calcium. You still have to check your levels weekly or bi-weekly and adjust with individual additives but probably not that much. I hope Red Sea is not marketing this product as single solution for dosing a reef tank like Tropic Marin did with Bio-Calcium. I used Bio-Calcium in the 90s with get results but you still have a test and tweak. Here's the decription from Read Sea's website.
Reef Foundation ABC+: Contains Calcium, Strontium, Barium, Bicarbonates, Magnesium, Potassium, Boron, Iodine, and Bromine formulated according to the exact ratio found in the coral skeleton. This unique powder supplement simplifies the daily dosing of more than just the foundation elements, and is recommended for aquariums of up to about 300 liters / 75gallons.