The first thing we did was to filter the water samples with a membrane filter that is so fine that not even bacteria can pass through, but water can.
Therefore, after filtration, we would have all particles such as bacteria and larger dirt pieces in the filter.
From the 1 liter in each bottle, we only used 400 ml because previous experiments showed that filtering the remaining 600 ml is very time consuming because the membrane filter gets clogged up.
Therefore, the filtration step allows us to reduce those 400 ml volumes to more manageable Eppendorf tube volumes: Figure 13. "An Eppendorf tube.". Reagents are expensive, and lab bench centrifuges are small!
Since the filter is so fine, filtering by gravity alone would take forever, and so we used a vacuum pump to speed thing up!
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