The size of feeders will vary depending upon the specific weight of the ingredient and the feed rate required. For ingredients having a high specific weight, such as minerals, greater accuracy can be attained by using to speed motors or variable frequency drives. The slower speed at the end of the weight period will increase accuracy. In modern computer controlled bathing operations, it is necessary to size all feeders so that the weighting of bulk ingredients is fast enough to be completed in the available weighting time in the batching cycle while maintaining the required accuracy. Weighting of ingredients not should be a hold up in the batching process.