The EZ WAY filter is designed to be a searchable filter and cannot run dry. It is made to be very easy to use and rinse. A square grid pattern on the bottom allows up and down searching. The lid can be capped or uncapped. A plug is included with the filter to keep fluid from leaking while on the microscope. Filter pore size is 64 micron and has excellent flow rate. Filter is single packed and Gamma Irradiated.