Dialysis system for ultra-low total chlorine detection in at least partially purified water

A dialysis system comprising:

• a water purification machine producing at least partially purified water including an at least partially purified water sample, the water purification machine including
• an electrode pair in contact with the at least partially purified water sample,
• an electrical circuit electrically connected to the electrode pair, and
• a control unit electrically connected to the electrical circuit, the control unit programmed to
• before introduction of the at least partially purified water sample, measure a background voltage VB using the electrode pair, the background voltage VB associated with potential tri-iodide before introduction of the at least partially purified water sample,
• before (i), measure a baseline voltage V0 using the electrode pair, the baseline voltage V0 associated with tri-iodide present in the at least partially purified water sample before (i),
• (i) at a first time use the electrical circuit to apply a source voltage to the at least partially purified water sample via the electrode pair,
• (ii) at a second time use the electrical circuit to stop applying the source voltage to the at least partially purified water sample,
• after (ii), measure a monitored voltage V1 using the electrode pair for a time t1, the monitored voltage V1 associated with an amount of tri-iodide in the at least partially purified water sample, and
• (iii) determine an amount of total chlorine in the at least partially purified water sample using the baseline voltage V0, the background voltage VB, and the monitored voltage V1;
• and
• a dialysis machine for providing a dialysis treatment to a patient, the dialysis machine receiving the at least partially purified water from the water purification machine to prepare dialysis fluid for the dialysis treatment.