If your plants are clean( IE no virus. bacterial rot, fungal infections or pest) your okey.
If they arent all clean you could generate a lot of trouble for yourself and your plants.
I treat all mine like they need to have The Universal Bio Hazard rules applied and try to make an honest effort not to re use water or media to save a few bucks..
Im going to quote "You spend a lot of money on your orchids why are we being cheap taking care of them?"
I dont know but dont be cheap with your plants. Buy Cheap Tofu instead