The open chip is designed to allow direct access to membrane areas and provide a permanent entry port for liquid supply, storage and exchange. It features 4 independent membranes. In combination with microfluidic ChipShop’s matching Interaction Tanks like Fluidic 234 and 235 for liquid supply and storage this chip allows for a wide variety of filtering and assay tasks. Interaction tank Fluidic 235 is equipped with a cap that includes Mini Luer fluidic interfaces to be easily connected to pumps for permanent operation.