Let's collect all relevant information about success, failures and improvements here.
Mung seeds have been selected as the first test candidate because they don't require to be cooked in order to become edible (some sprouts do), offer a great range of vitamins and minerals and should be easily obtainable everywhere.
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The seeds have been completely submerged in room temperature tap water for about 8 hours in a cup, then put into the seedstack container. The seeds will sprout without this step, however, giving the seeds 8 hours in water seems to have an effect on the overall mass the sprouts will yield.
After putting the seeds into the seedstack container, they need to be flushed twice per day (morning/evening). To flush the seeds, about 500ml of water are poured into the topmost container (if you have more than one) and will drain automatically at the bottom of the container through the syphon. This might also be a good job for an Arduino controlled valve/pump.
Here are list of beans we tried, but would not sprout using the normal treatment, if you have any advice please open an issue in the issue tracker.