Can I tone my hair while using no poo method

I’m just beginning the no poo method and so far it’s working well for my dry colour treated hair. I have to use a toner to keep the red out my blonde hair every so often but am afraid it will set me back to the beginning if I do…?

This is a question I want to ask as well, sorry I can’t help you. I have my roots coloured approx 6 weekly and I want to know if this will be a set back; not sure I’m ready for grey yet!