This was at one time a significant issue.  However, with this new third-generation Microcyn Technology, fully freezing the liquid products will reduce their FAC (free available chlorine) by approximately 7%.  In that instance, MicrocynVS, once thawed, remains highly efficacious. The gel products are similar in terms of FAC reduction, however once liquified, they will not return to their gel state, but maintain an efficacious level of FAC.