Di-chlor powder has even MORE stabilizer than Tri-chlor tablets. It adds about as much per pound as it does chlorine.

Cal-hypo powder has NO stabilizer at all. Usually bags of "Shock" are this, but not necessarily. It adds calcium instead.

Both are EXTREMELY common so I cannot guess which you are using.

There is Tri-chlor powder and Lithium chloride powder but both are not common. The latter doesn't have stabilizer either. You probably have neither.