Let's say you buy a center and want to use H2O2  instead of the chlorine that was being used by the previous owner. Or maybe you want to switch over to H2O2  after using chlorine for a while. Let's further assume that this is in compliance with your health department and your UV system is sized adequately. What else do you need to know to make this happen? Do you need to change the water? 

Ashkahn and Graham lay out all the things to consider and why someone may or may not want to replace the solution in their tank at the same time as replacing the water treatment method in a float tank.