Aqua-Filter (CTP1)

The Aqua-Filter is a city improvement in Civilization: Call to Power.
== Effect ==
The Aqua-Filter lowers a city's overcrowding by 5, while giving safe, purified water to the citizens,
== Great Library entry ==
During the late 21st century, the earth faced a global water crisis. Dust bowls threatened the Great Plains, and expansion of the Sahara loomed dangerously over the Middle East and North Africa. A great search began for drinkable water, and an answer appeared from the most unlikely of sources: the Fuel Cell. The Fuel Cell required highly efficient, microscopic catalysts that bound hydrogen and oxygen without ignition. The catalytic elements also suggested a second use: the purification of water. The Aqua-Filter came into being.
== See also ==
* Aqua-Filter in other games