Page 85 - The Lost Ways

First, there were sand filters. These use the compact soil and its ability to soak in water.
History records that people used to run water slowly and carefully through three to five
feet of sand. They would boil the water after that, when they knew that the water was no

longer filled with dangerous microorganisms and debris. The important thing to know
about sand filters is that the top layer should be cleaned off and replaced regularly.

84