Gradually add waste until the top tray is completely full. This will take longer than you think because every time you add waste and the worms process it - it drastically reduces in volume. At this stage most of the worms will be in the Top Tray - the Bottom Tray will contain fully worked waste, ie worm casts. Now is the time to take out the Bottom Working Tray and harvest the rich casts. Once you have emptied this Bottom Working Tray it goes back on the top of the pile becoming the new Top Working Tray and you start adding scraps here to begin the process all over again.
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The following tips represent the result of a great deal of experience in worm-assisted composting. Please read them carefully and try to follow their advice. If you follow them properly you will have a contented stock of worms which, in due course, will produce for you a steady stream of rich dark compost.