Ruth,
Am using Kent salt, which I understand may be low in Mg. Haven't tested it, though, after mixing up a batch of NSW.
Also, don't have Ca reactors on any of my tanks. Heck, don't even skim or have sumps. Very low tech operations in our reefs. Rely on hands on work to keep our BB tanks in shape. Should take some pics of them and post to the new thread. They look great. No nuisance algae in any of the tanks. Corals, BTAs and frags are all doing very well
