Patent ID: 11953487
Assignee: ECOWATER SYSTEMS LLC
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 7:
8. An apparatus for determining hardness in water, said apparatus comprising:
a first sodium ISE sensor coupled with a first reference electrode, said first sodium ISE sensor configured to receive hard water, wherein said first reference electrode is in contact with a KCl solution and bound by a first dialysis membrane;
a second sodium ISE sensor coupled with a second reference electrode, said second sodium ISE sensor in electrical communication with said first sodium ISE sensor, and configured to receive soft water;
said first and second reference electrodes having a salt bridge therebetween; and
at least one drain to receive outflow from effluent fluid from said first and second sodium ISE sensors;
wherein said first sodium ISE sensor includes a chamber between two membranes where fluid can be introduced for measurement and dispensed, and such that there is electrical continuity from a working electrode, through a conductive solution, an ionophore membrane, said fluid, the first dialysis membrane, said KCl solution, and to said first reference electrode.