Using agri-fos systemic fertilizer with fuzzy orchid

[Mercurianmad]

So I just got some systemic Agri-fos. The instructions talk about putting it in a sprayer. How do you guys use it? Thus is for possible fuzzy fungus on the roots of my phalaenopsis rescue. Should I drench the pot like soaking it in the fungicide? Or just pour it through the medium? I need to get this fuzz under control before the roots can get healthy, I think.

Then hopefully the kelpmaxx stuff will help the roots grow. All other factors seem set up now- aeration, watering, drainage, humidity tray. I just want this little guy to get healthy, although I’m not sure how new leaves are going to grow with the big leaf on top being so twisted over the plant...oh well. We’ll get there when we get there. Root health first.