What is the difference between SysPrep and PrimoPrep, and do I need to use both?

SysPrep is a flushing agent for helping clear minor debris from the system and take care of some light pH neutralization work. PrimoPrep is a chemical treatment for specific metals in the loop to make them less prone to reacting with the environment, which causes pH shift down the line, along with other unwanted reactions. It also helps neutralize pH. It is important to run both SysPrep or Reboot and PrimoPrep after Rad Clean to neutralize the remnant acidity and treat the metals within.