Patent ID: 8658043

Claim:
A household water treatment system, comprising: a pressurized vessel fluidly connected to a point of entry; an electrochemical water treatment device fluidly connected to the pressurized vessel, the electrochemical water treatment device comprising: a depleting compartment in fluid communication with the pressurized vessel; a concentrating compartment in fluid communication with the point of entry; and a concentrate stream recirculation line fluidly connecting an outlet of the concentrating compartment to an inlet of the concentrating compartment; a controller configured to: calculate a Langelier Saturation Index (LSI) of treated water produced by the electrochemical water treatment device based on a continuous or intermittent measurement of at least one water property sensor; adjustably maintain an operating parameter of the electrochemical water treatment device based on a difference between the calculated LSI and a set point LSI to produce treated water having an LSI of less than about 2; discharge a portion of the concentrate stream to drain; and deliver make-up water from the point of entry to the concentrating compartment in an amount sufficient to compensate for the discharged portion of the concentrate stream; a water distribution system fluidly connected to the pressurized vessel; and at least one point of use fluidly connected to the water distribution system.