A mixer assembly, comprising: a mixer body, comprising: an inner wall defining a mixing chamber having an inlet and an outlet, wherein the inner wall includes a plurality of protrusions disposed on top of the inner wall, thereby forming a plurality of passes between the plurality of protrusions, further wherein a product enters the mixing chamber through the inlet and exits the mixing chamber through the outlet; and a shell disposed around the inner wall, such that the inner wall and the shell form a diluent chamber therebetween that surrounds the mixing chamber, the diluent chamber including an inlet and an outlet communicating with the plurality of passes, wherein a diluent entering the diluent chamber through the inlet fills the diluent chamber and exits the diluent chamber through the outlet, further wherein the diluent flows from the outlet through the plurality of passes and to the mixing chamber for mixing with the product entering the inlet of the mixing chamber, still further wherein the product mixes with the diluent in the mixing chamber and a mixed product moves to the outlet for delivery. a mixer body, comprising: an inner wall defining a mixing chamber having an inlet and an outlet, wherein the inner wall includes a plurality of protrusions disposed on top of the inner wall, thereby forming a plurality of passes between the plurality of protrusions, further wherein a product enters the mixing chamber through the inlet and exits the mixing chamber through the outlet; and a shell disposed around the inner wall, such that the inner wall and the shell form a diluent chamber therebetween that surrounds the mixing chamber, the diluent chamber including an inlet and an outlet communicating with the plurality of passes, wherein a diluent entering the diluent chamber through the inlet fills the diluent chamber and exits the diluent chamber through the outlet, further wherein the diluent flows from the outlet through the plurality of passes and to the mixing chamber for mixing with the product entering the inlet of the mixing chamber, still further wherein the product mixes with the diluent in the mixing chamber and a mixed product moves to the outlet for delivery. an inner wall defining a mixing chamber having an inlet and an outlet, wherein the inner wall includes a plurality of protrusions disposed on top of the inner wall, thereby forming a plurality of passes between the plurality of protrusions, further wherein a product enters the mixing chamber through the inlet and exits the mixing chamber through the outlet; and a shell disposed around the inner wall, such that the inner wall and the shell form a diluent chamber therebetween that surrounds the mixing chamber, the diluent chamber including an inlet and an outlet communicating with the plurality of passes, wherein a diluent entering the diluent chamber through the inlet fills the diluent chamber and exits the diluent chamber through the outlet, further wherein the diluent flows from the outlet through the plurality of passes and to the mixing chamber for mixing with the product entering the inlet of the mixing chamber, still further wherein the product mixes with the diluent in the mixing chamber and a mixed product moves to the outlet for delivery.