I'd go with the ones from GLA. They're effective, aesthetically pleasing, and way more affordable. Hell, buy two or three incase you drop one or something and it's still a little less than the ones from Do! Aqua.
My only concern is if your DIY mix will build enough pressure to push through the ceramic diffuser, cause if not, you might end up with a mini IED in you're room!
My only concern is if your DIY mix will build enough pressure to push through the ceramic diffuser, cause if not, you might end up with a mini IED in you're room!