Calculating a depletion time during dialysis

A method comprising:

• receiving a container of a definite volume, the container containing a concentrate;
• determining the volume of the container using a pressure sensor, a controller, a timer, and a fluid source upstream of the pressure sensor;
• calculating a depletion time in which the concentrate will be depleted from the container;
• comparing the depletion time with a prescribed treatment time;
• determining that the depletion time is equal to or greater than the prescribed treatment time based on comparing the depletion time with the prescribed treatment time;
• and
• in response to determining that the depletion time is equal to or greater than the prescribed treatment time, causing a dialysis treatment machine coupled to the container to initiate treatment.

A method comprising:

• receiving a container of a definite volume, the container containing a concentrate;
• determining the volume of the container using a pressure sensor, a controller, a timer, and a fluid source upstream of the pressure sensor, wherein determining the volume of the container comprises:
• initiating the timer to record an elapsed time;
• flowing fluid from the fluid source upstream of the pressure sensor into the container while measuring a pressure within the container using the pressure sensor;
• comparing the pressure within the container measured using the pressure sensor to a reference pressure;
• determining, based comparing the pressure measured using the pressure sensor to the reference pressure, that the pressure measured using the pressure sensor equals the reference pressure;
• determining, based on the elapsed time recorded by the timer, an amount of time elapsed for the pressure measured using the pressure sensor to equal the reference pressure;
• and
• comparing the amount of time elapsed to one or more time ranges corresponding to one or more known container volumes;
• and
• calculating a depletion time in which the concentrate will be depleted from the container.