For regular concentrates I work on a total of 15% For the berries it would be 8% fruit, 5% menthol (reg strength) and 2% koolada For melons and...
Yeah I don't have one either and really keen on trying one, a railbox would be sweet but im just not willing to spend $500+ on a 40w device...
I use hacks method and I have never had an issue with this. still, nice one solving your problem.
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