calcium hypo vs. calcium chloride

[polyvue]

As I thought Calcium Carbonate was the usual calcium increaser I wondered if Calcium Chloride releases its chlorine into the water as well.

Apparently not. Though don't ask me to explain the chemistry:

Calcium chloride can serve as a source of calcium ions in a solution; unlike many other calcium compounds, which are insoluble, calcium chloride is able to dissociate.

3 CaCl2 + 2 K3PO4 (aq) → Ca3(PO4)2 (s) + 6 KCl (aq)

Source: http://en.wikipedia.org/wiki/Calcium_chloride