Just get a horticultural heat mat [$25] to do your heat purge [someone else thought of this, can't think who] They're also brilliant for cloningHey homie! Haha...By "lengthy" water purge, I meant several hours, maybe 24+...I used to just keep changing the water under the dish when it would go cold, since I didn't wanna keep it on a double boiler. But we should find you access to a vacuum chamber somehow...lol...any idea on when you were planning to begin this venture?