Final answer:
The treatment termination/disinfection step 3 for a catheter involves disinfection using chlorine and other chemicals, but excess quantities of chlorine can be harmful and must be neutralized.
Step-by-step explanation:
The treatment termination/disinfection step 3 for a catheter involves disinfection to kill remaining harmful bacteria and other pathogens. Chlorine and other chemicals are commonly added in a disinfection tank, but excess quantities of chlorine can be harmful and must be neutralized with other chemicals after it has killed the bacteria to protect marine organisms.