====Operation====
As the inner pipe is lifted, the water in it is also lifted. When the pipe is lowered, more water is forced into it from the bottom. This process continues until water starts to flow from the pump head.
====Maintenance====
* [http://www.swsfilt.co.uk/ SWS Filtration Limited], the company of Richard Cansdale.
==References==
<references/>
{{Joinus}}