Agree with all above. I've got lettuce in mine at the moment and having to top up every 5 or 6 days now, though as the roots grow it's getting to be more like 4 or 5 days.
So much awesome info. Thanks all! May have to try the bosses advice re peppers next time I smoke jerk marinated chicken. One mild with a couple MoA's for the better half, and yellow 7's for myself.