I mix percarb a little strong and either DS or Xjet it. Never had an issue with it not working fast enough. On a deck where I'm going to use percarb, I love inviting the HO to watch me clean. I like to turn customrers into company cheerleaders by showing them the percarb process in particular.
FYI: After it fizzes out, percarb leaves behind water, hodrogen peroxide and sodium carbonate (water softener salt). Nothing else.
That's interesting. So then rinse and follow up with Oxalic and then rinse again? Sounds promising.