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MERC – Membrane Filter Test Plan
16
7.
Remove any trapped air in the holder by VERY briefly turning on the sample pump until
water flows from the top and/or around the threads. Caution: Water will likely spray a little,
so be prepared!
8.
Close the filter holder tightly and make sure the outlet is securely in the measurement jug
9.
Turn on the pump and adjust the pressure to 30 psig
10. Record the time
11. Keep track of the volume in the measurement jug. If the level reaches 15 liters, use another
measurement jug to continue measurement and empty the used jug. Continue to keep track of
the total volume filtered until the test is complete.
12. When the test is complete
a.
Shut off the sample pump
b.
Shut the sample valve to the overflow bucket
c.
Record the total volume collected in the measurement jugs
d.
Carefully remove the filter disk for each test and place it in the small (2”x2”) square filter
disk container (has “Millipore” written on it). Mark the container with the test number
and the filter disk number.
e.
The filter disk will be dried and measured by vendor.
g.
If any of the prefilters (Filter #2, #3, #4) plug quickly and reach 30 psid before the final
filter (Filter #1)
ii.
Record all measurements per step 6
iii.
Stop the low-level TSS sample pumps
iv.
Shut down and replace the plugged prefilter (Filter #2,#3, or #4)
v.
DO NOT change the 0.45 filter disk on the final filter (Filter #1).
vi.
If it is the first pre-filter (Filter #2) that plugs, DO NOT change the 0.45um disk on
the 2
nd
and 3
rd
prefilters
vii.
If it is either the 2
nd
or 3
rd
prefilter (that are using the low-level TSS test) that plug,
then
f.
Record the total volume collected in the measurement jug for the filter that plugged
g.
Carefully remove the filter disk from the filter that plugged and place it in the small
(2”x2”) square filter disk container (has “Millipore” written on it). Mark the container
with the test number and the filter disk number.
h.
The filter disk will be dried and measured by vendor.
viii.
Restart the system
ix.
Restart the sample pumps for the low-level TSS tests.
x.
Record all measurements per step 6.
xi.
Continue with the rest of the test.
TEST #6
1. Repeat Test#5, except install Filter #5 (20” 0.1) in the final filter housing (#4)