Abstract: A dialysis reuse system for cleansing, sterilizing and testing a hemodialysis machine and its associated dialyzer and blood tubing set. The reuse control device automatically controls either the selected reuse cycle or dialyzer test cycle as desired. In the reuse cycle a proper solution of bleach, rinse water and formaldehyde disinfectant is flushed through the system for a prearranged time period and in proper sequence to completely cleanse and disinfect the entire dialysis system including the dialyzer and blood lines. At the end of the cycle, the system is isolated, leaving the disinfectant solution intact within the system to prevent bacteria growth and contamination. In the dialyzer test cycle, a dialyzer clearance test is automatically performed using the associated hemodialysis machine to test the condition of the dialyzer membrane prior to patient treatment.