A submerged membrane filter apparatus for microbiological sampling

@article{Williams1969ASM,
  title={A submerged membrane filter apparatus for microbiological sampling},
  author={E. Williams},
  journal={Marine Biology},
  year={1969},
  volume={3},
  pages={78-80}
}
The sampler is operated by hydrostatic pressure and consists of a stainless steel cylinder to which is attached a membrane filter holder. A glass inlet tube is broken by a messenger and a predetermined volume of water is filtered. Valves protect the membrane from flow-back and release the pressure as the sampler returns to the surface. The sampler works satisfactorily at 15 m and is strong enough to be used down to 6000 m. The filling rate is controlled by a jet behind the filter holder. 
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References

The membrane filter in marine microbiology.
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