Physan vs. phyton soak

[Nekko]

Hello,
I have root rot on a few of my phals. Should I soak the roots in Physan or Phyton , before repotting them? As I understand it, Physan is more of a topical treatment, and phyton 27 is a systemic fungicide/bacterialcide. However, I was told I could soak the roots with phyton 27, then treat it systemically twice in ten days with this. has anyone tried soaking in phyton vs. Physan? I have read through much of the phal abuse thread, but not all of it, and I apologize if it was already discussed somewhere. Thank you for any help.