While PhyNexus offers many standard resins for PhyTip columns there may be cases where custom resins are desired. For example, a company or research group may decide to employ certified resin lots to develop and scale up separations. PhyNexus will pack virtually and affinity style or flash chromatography resin to PhyTip columns. Columns can be produced to be compatible with any robotics system. Resins are shipped from the supplier or from the user to PhyNexus. Excess resin is either returned to the user or it may be tagged and stored for future orders.