Water Filtration

We purchased a new gravity water filter, the Berkey Royal that holds the Black Filters.  This unit has a 3.25 gallon reservoir.  There are two filters in the system which can hold up to 4.  Each filter will purify 3,000 gallons of water.  There is much information, reviews and videos on this water filter system.  I have watched videos of people filtering creek water.  We will be installing rain barrels to harvest rain water from our roof.  That water will be used for the garden, but if really needed in an emergency, we should be able to filter the water with this system.  We plan to purchase about 4 filters to keep on hand.  This filter and the rain barrels will help us keep water on hand if its ever needed for more than just the garden.