There is a small area on the top of the seed cleaner where you slowly pour in the seed or seed mixtures. At the top of the unit there is a slider which can be adjusted depending on the density of the seed to let it trickle through. At the bottom of the unit is two buckets ones for seed and one for the dust and husks. Once you find the perfect position for your particular seed or seed mixture, note that position for this particular seed mixture. Only suitable for budgie, finch and canary seed.