The best loved European tray sprouter, Bio-Set is supposed to do some of the work of sprouting for you - by helping with the Rinsing and Draining. It has 3 growing trays. Bio-Set isn't like our other tray sprouters. It is a siphon sprouter (like Biosta - a sprouter we no longer sell), which works on the principle of retained high humidity. We are big on Rinsing, Draining and air-circulation, so we are generally at odds with this concept. According to the manufacturer's directions: Water enters the Bio-Set by filling the top tray - the reservoir tray as we call it. The water then siphons down to the lower trays - one by one - through the siphon holes, and ends up in the drip tray at the bottom of the stack. The concept is this: Water is retained in the grooves on the bottom of each growing tray, creating humidity, theoretically conducive to sprouting. The Bio-Set is 8 1/4 inches tall, 6 inches in diameter. It has three 1 1/2 inch tall, clear growing trays, a white drip tray and the top reservoir tray - where you add water - also white. The bottom of each tray is full of grooves. Water remains in those grooves and because of the sealed nature of the device, creates the high humidity desired. In theory your seeds will germinate in this very humid space. The problem is that, when your seeds are small (Leafy Sprouts like Alfalfa and Clover, small Brassicas like Broccoli and Mustard, etc.) - they sit in the grooves, and therefore in water. In our experience, a seed that sits in water will rot before it germinates. Though we are generally opposed to this concept - it can work. Big seeds (like Beans and Grains do quite well, because they are too big to sit under-water in the tray's grooves.
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