Advantages of a small slow sand filter
They are the best way to remove beaver fever bacteria from water.
They can remove over 99 percent of harmful bacteria from water.
They can remove from 91 to 99.999 percent of viruses from water.30
They improve water clarity.
They do not require the addition of chemicals to function.
They can be designed to function using only the power of gravity.
They can last for many years with only occasionally adding more sand to the top layer.
They are inexpensive.
They do not pollute.
They are sustainable technology.
They do not produce harmful byproducts as do chlorine and ozone purification processes.
Maintenance is simple and easily understood.
Their construction is easily understood.
They can be built from locally available materials.
They can operate in remote areas where no electrical power or petroleum energy is available.
They empower the individual.
The theory of operation is easily understood.