Perhaps it's worth experimenting with temperatures? DWC water is kept at low temp to allow more oxygen to be dissolved. Perhaps we could exploit the same idea? Just thinking out loud.
Oh, I didn't mean for the oxygen sorry. I just remember reading about something, I can't remember what it was(!) but I noticed that the highest saturation levels, if that's the word, occurred at a higher temp than the water/oxygen related temp. So I would guess that maybe every substance has a unique best saturation temp.
Hopefully that makes sense. On the other hand though, if that did apply, what happens when that temp is not maintained....I guess it would drop in PPMs again. Bugger.
That does make sense what you said. Maybe use a high temp to discourage oxygen?