1.  The best prevention is to boil or filter water, and eat only well-cooked food.

2.  The best prevention for cholera is to boil or filter water, and eat only well-cooked food.

3.  It then filters the water several times, treats it, and calls it table water.

4.  Among the important functions they serve are providing habitat for wildlife, filtering polluted water and absorbing flood waters.

5.  And trees and green spaces will be carved out of the vast parking lots to help filter the water running off into the creeks and streams.

6.  A city purifies its water supply by filtering the water and then forcing it through an aviator.

7.  Called a microbial rock filter, the water feeds the plants and the rocks filter the water.

8.  Commercial pool equipment housed in a soundproof closet keeps the pristine water filtered and circulated.

9.  Edison now uses a different process to filter the water so a weaker acid solution can be used for cleaning.

10.  In addition to filtering the water and adding the proper chemicals, it is important to set up a regular maintenance schedule to avoid problems and protect the pool.