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INSTRUCTION MANUAL
2019
DETERMINING A REALISTIC SAMPLE VOLUME
If you are working in a new environment and the filterable water volume is not
known, the low flow alarm can be used as an objective measure of filter clog-
ging. When setting up a new project we recommend following this procedure in
the worst-case scenario (highest likely level of suspended particulate) such as
after a rain event. Then, a standardized sample volume (e.g. 1L) can be set for all
samples, knowing that this volume is achievable under highly turbid conditions
in your study system.
The following can be done with multiple filter pore sizes to determine which
should be used:
1. System beeps twice
2. Rotate quickly to invert
4. Retract pole to remove filter
3. Elevate filter housing
