Patent ID: 11865240
Assignee: NXSTAGE MEDICAL, INC.
Field: Environmental technology (Chemistry)
Classification: CPC A  C | IPC A  C

Claim 0:
1. A method of delivering a blood treatment, comprising:
carbon-filtering primary tap water to generate chloramine-free water;
deionizing the chloramine-free water to a predetermined level of resistivity, to generate deionized product water, the predetermined level of resistivity being selected to be low enough to permit a detection of chloramine in the deionized product water resulting from a failure of said carbon-filtering;
determining, responsively to time and/or to a cumulative volume of the chloramine-free water generated by said carbon-filtering, that at least one carbon filter used to perform said carbon-filtering is to be replaced and, responsively to said determining, outputting a command signal to replace said at least one carbon filter;
said determining being effective to ensure that a chloramine level in said deionized product water is below a predetermined safe level for use in a dialysis, hemodiafiltration, or hemofiltration treatment of a human, said predetermined safe level being according to a predefined medical standard with a margin for safety based on a predicted water quality and a predicted chloramine removing efficacy of said at least one carbon filter; and
ensuring in case of an error in said carbon-filtering, that said deionized product water is safe, by determining a chloramine concentration in the deionized product water based on a resistivity measurement and a temperature measurement of the deionized product water; and
controlling a flow of said deionized product water responsively to the determining.