Vinyl
From page 14
blue, however, are susceptible to loss of color if they are exposed to high trichlor concentrations for a period as short as 6 hours. The reasons are a high available chlorine content of 90 percent, low solubility of the granules or puck, and the extremely low pH produced at the contact site.
Dichlor, calcium hypochlorite, and sodium hypochlorite (liquid chlorine) do not have as