6.6 Test Membrane Filters, 6,7 plain, 47-mm diameter,nominal pore size 0.8 μm (see Note 1).
6.7 Control Membrane Filters, 6,7 47-mm diameter, nominal pore size 0.8 μm. (Gridded control membrane filters may be
used for purpose of identification.)
NOTE 1—Matched weight membrane filters,6 47-mm diameter, nominal
pore size 0.8 μm, may be used as test and control membrane filters if so
desired. Use of matched-weight membrane filters precludes the necessity
for carrying out subsequently the procedures detailed in Section 10.
6.8 Dispenser for Flushing Fluid, 0.45-μm membrane filters to be provided in the delivery line (see Fig. 1).
6.9 Air Ionizer, for the balance case. See Note 2 and Note 3.
NOTE 2—When using a solid-pan balance, the air ionizer may be
omitted provided that, when weighing a membrane filter, it is placed on
the pan so that no part protrudes over the edge of the pan.
NOTE 3—Air ionizers should be replaced within 1 year of manufacture.