monitoring kit (DX360
NIHON KOHDEN) was combined with a bridge amplifier (ADInstruments
FE221) and an AD converter (ADInstruments ML826 PowerLab 2/26) to
measure the differential pressure for microfiltration. Differential
pressure was calculated by detecting the pressures upstream and downstream
of the filter using a transducer. The pressure drop was evaluated
from the differential pressure 300 s after initiating filtration.