A system for mixing a liquid solution or suspension comprising: (a) a container assembly comprising: a collapsible bag bounding a compartment and having an upper end and an opposing lower end, the collapsible bag being comprised of a polymeric film and being adapted to hold a fluid; a sparger disposed at the lower end of the collapsible bag for delivering a gas into the compartment of the collapsible bag; an exhaust port secured to the upper end of the collapsible bag and bounding a port opening that extends therethrough and communicates with the compartment of the collapsible bag; and (b) a condenser bag (102, 102A, 102B) comprising: a body bounding a channel that extends between an inlet opening at a first end and an outlet opening and an opposing second end, the body being comprised of a polymeric film; and an intake port secured to the body at the inlet opening and bounding an port opening that extends therethrough and communicates with the channel, the intake port of the condenser bag being coupled with the exhaust port on the collapsible bag so that the intake port is disposed at an elevation above the upper end of the collapsible bag; and a condenser comprising a first panel and a second panel the latter, made ' from metal, wherein the condenser bag is positioned in a gap between the first panel and the second panel. (a) a container assembly comprising: a collapsible bag bounding a compartment and having an upper end and an opposing lower end, the collapsible bag being comprised of a polymeric film and being adapted to hold a fluid; a sparger disposed at the lower end of the collapsible bag for delivering a gas into the compartment of the collapsible bag; an exhaust port secured to the upper end of the collapsible bag and bounding a port opening that extends therethrough and communicates with the compartment of the collapsible bag; and a collapsible bag bounding a compartment and having an upper end and an opposing lower end, the collapsible bag being comprised of a polymeric film and being adapted to hold a fluid; a sparger disposed at the lower end of the collapsible bag for delivering a gas into the compartment of the collapsible bag; an exhaust port secured to the upper end of the collapsible bag and bounding a port opening that extends therethrough and communicates with the compartment of the collapsible bag; and (b) a condenser bag (102, 102A, 102B) comprising: a body bounding a channel that extends between an inlet opening at a first end and an outlet opening and an opposing second end, the body being comprised of a polymeric film; and an intake port secured to the body at the inlet opening and bounding an port opening that extends therethrough and communicates with the channel, the intake port of the condenser bag being coupled with the exhaust port on the collapsible bag so that the intake port is disposed at an elevation above the upper end of the collapsible bag; and a condenser comprising a first panel and a second panel the latter, made ' from metal, wherein the condenser bag is positioned in a gap between the first panel and the second panel. a body bounding a channel that extends between an inlet opening at a first end and an outlet opening and an opposing second end, the body being comprised of a polymeric film; and an intake port secured to the body at the inlet opening and bounding an port opening that extends therethrough and communicates with the channel, the intake port of the condenser bag being coupled with the exhaust port on the collapsible bag so that the intake port is disposed at an elevation above the upper end of the collapsible bag; and a condenser comprising a first panel and a second panel the latter, made ' from metal, wherein the condenser bag is positioned in a gap between the first panel and the second panel.