We have developed a practical and economical device that efficiently concentrates ciliated cells, such as Tetrahymena pyriformis, by using only low-speed, non-damaging centrifugation. This is carried out with a simple device consisting of a microcentrifuge tube connected to the barrel of a 60-ml plastic syringe. This device allows the concentration of essentially all the cells into a small volume without damaging cell structures or reducing their viability.