Sieve system and methods for cell media exchange

A cell culture sieve system (100) comprising

• a culture substrate (105) and a side wall (110) disposed atop the culture substrate (105) to form a container for holding media and cells in culture, wherein the side wall has at least one gap (122) disposed therein, wherein the at least one gap (122) directly connects the container with an exterior of the cell culture system, at least one slot (128) is disposed between a bottom of the side wall and the culture substrate, wherein the at least one slot (128) is a cut or hole in an adhesive connecting the sidewall to the culture substrate, wherein the at least one slot (128) is sized and configured to receive a pipette tip, wherein the at least one gap (122) and the at least one slot (128) are configured to retain media via surface tension and to prevent media from leaking from the container, wherein when suction is applied to the at least one slot (128) or the at least one gap (122), media is aspirated from the container via the at least one slot (128) or the at least one gap (122), wherein the at least one gap (122) and the at least one slot (128) are sized and configured to prevent cells within the container from exiting the container, and wherein the at least one gap (122) forms an interface between the media within the container and air.