A liquid conditioning module for conditioning liquids flowing through a main flow path and a bypass flow path fluidly coupled to the main flow path having a fraction of liquid from the main flow path therethrough, the liquid conditioning module comprising: an inlet fluidly coupled to a bypass flow inlet; a reservoir holding one or more treatment components to be added to liquid entering the reservoir from the bypass flow path to form a treatment solution, the treatment solution flowing into the main flow path via a bypass flow outlet, the treatment components being in solid form, and forming layers in the reservoir, the layers comprising a dry solid treatment layer near a bottom surface of the reservoir, a suspended treatment material layer thereabove, and one or more layers of aqueous treatment solution, each layer having a different concentration of the treatment component, the treatment solution layer immediately above the suspended treatment material layer having the highest treatment concentration in the reservoir; an outlet fluidly coupled to the reservoir and the bypass flow outlet; and a drop tube system comprising: a hollow tube having a first tube end and a weight attached to the first tube end adapted to be freely suspended in the treatment solution and to maintain a desired position corresponding to the highest solution concentration, the weight being chosen based on the treatment material being used; and a second tube end fluidly coupled to the outlet of the liquid conditioning module through which the treatment solution flows out of the reservoir toward the main flow path. an inlet fluidly coupled to a bypass flow inlet; a reservoir holding one or more treatment components to be added to liquid entering the reservoir from the bypass flow path to form a treatment solution, the treatment solution flowing into the main flow path via a bypass flow outlet, the treatment components being in solid form, and forming layers in the reservoir, the layers comprising a dry solid treatment layer near a bottom surface of the reservoir, a suspended treatment material layer thereabove, and one or more layers of aqueous treatment solution, each layer having a different concentration of the treatment component, the treatment solution layer immediately above the suspended treatment material layer having the highest treatment concentration in the reservoir; an outlet fluidly coupled to the reservoir and the bypass flow outlet; and a drop tube system comprising: a hollow tube having a first tube end and a weight attached to the first tube end adapted to be freely suspended in the treatment solution and to maintain a desired position corresponding to the highest solution concentration, the weight being chosen based on the treatment material being used; and a second tube end fluidly coupled to the outlet of the liquid conditioning module through which the treatment solution flows out of the reservoir toward the main flow path. a hollow tube having a first tube end and a weight attached to the first tube end adapted to be freely suspended in the treatment solution and to maintain a desired position corresponding to the highest solution concentration, the weight being chosen based on the treatment material being used; and a second tube end fluidly coupled to the outlet of the liquid conditioning module through which the treatment solution flows out of the reservoir toward the main flow path.