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It's not really meant to be a calcium reactor, it's meant for reducing nitrates so you can keep your water in great shape and still feed enough. IMO, most people do not feed their tanks nearly enough when comparing to the amount of food these fish/animals/inverts/etc get in the wild. With proper trace element dosing, you could go quite a bit longer between water changes as well.
Will it keep up with calcium demand? Probably not if you have a lot of calcifying corals... However it would definately cut down on your dosing regime. If you have a 'full' tank of SPS then you are probably going to need a calcium reactor as well.
Combined with a kalk reactor it should add quite a bit of calcium to the water, but it will depend on the situation whether they would be all you would need.
The sulphur media is cheap and breaks down very slowly. (change every 18-24 months)
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