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 . <EOS>