Toxen Plastic Grocery Container - 2 L(Multicolor)
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Basically each compartment has a hole covered by a knob through which water slowly seeps into the compartment below that. Put grains/pulses in the compartments, keep lowest compartment empty, make sure the knobs of adjacent compartments are positioned in diametrically opposite directions. Fill the compartments with water, not exceeding the level of the knobs.