Patent ID: 7709265
Filing Date: 2010-05-04
Classification: A47L,C02F,D06F,G01N,Y10T

Abstract:
1. A method for dispensing a chelant and a cleaning agent, comprising: obtaining a first conductivity measurement; determining a first chelant amount based on the first conductivity measurement; adding the first chelant amount to a chamber from a chelant source; obtaining a second conductivity measurement; determining a chelant factor based on a plurality of values, including the first conductivity measurement, the second conductivity measurement, and the first chelant amount, wherein the chelant factor corresponds to a fraction of water conductivity due to hard water ions; storing the chelant factor; adding an amount of detergent to the chamber from a detergent source; and after storing the chelant factor: determining an additional amount of water added to the chamber; determining a second chelant amount in accordance with the additional amount of added water and the chelant factor; and adding the second chelant amount to the chamber.