A system for splitting a fluid includes a source support configured to support a source container and a satellite support configured to support a satellite container fluidly connected to the source container. A weight scale is associated with each of the supports. The system also includes a clamp system and a controller. The controller determines a plurality of possible distributions of the fluid between the source container and the satellite container based at least in part on the concentration or amount of said constituent and the combined weight measured by each weight scale, then controls the clamp system to selectively allow and prevent fluid flow from the source container to the satellite container so as to distribute the fluid between the source container and the satellite container according to one of the distributions, with at least one of the possible distributions being an uneven distribution of the fluid.