Combination of both I would think. I did find some blackish residue when I cleaned out the Vivi but then I've also been using this Vivi since Sunday, so a good 12 - 15ml of juice have been through it.
I normally just top up when it gets low, I'll probably wait a while longer now, and then clean and refill the tank with every fill I do. May help to reduce the residue at the bottom.
Thanks for confirming my findings.
I normally just top up when it gets low, I'll probably wait a while longer now, and then clean and refill the tank with every fill I do. May help to reduce the residue at the bottom.
Thanks for confirming my findings.