Hand-Driven Vacuum Pump for Filtering Water Samples
![a water filtering apparatus with manual hand pump attachment sitting on the ground beside a stream](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/Figure_1.jpg?itok=M5-vu7xc)
Detailed Description
A hand-driven pump can be used to filter water samples when electricity is not available at the sampling site, or when the weight of sampling equipment is a concern.
Sources/Usage
Public Domain.
Photo by Matthew Laramie