For water filtration at my home I use the Big Berkey® Water Filter which uses four black purification elements which remove harmful viruses & bacteria from the water but keep healthy minerals that your body needs. Each black purification element is able to purify up to 3,000 gallons of water for a total of 12,000 gallons before they need to be replaced.
It holds 2 gallons of water and is able to filter up to 7 gallons of water per hour. The Big Berkey® is suitable for up to 16 people which is overkill for the needs of my family, but I would rather have the capacity to purify more water than needed than not enough.
The Berkey® system uses a gravity flow design in which you pour unfiltered water into the top container and it uses gravity to draw the water down through the purification elements which are attached to the floor of the upper container and clean filter drinking water drips into the lower storage container. Both the upper and lower containers are constructed of high quality food grade stainless steel for easy sanitization.
One of the options that I love on my Big Berkey® is the water view spigot that shows you at a glance how much purified water is available in the storage tank.
If your water has been treated with fluoride and you wish to remove it there are specialized white fluoride filters available which remove up to 95% of fluoride from water and attach to the underside of the black filter elements.
One of the things that I love about my Berkey® is that I do not have to wait until a disaster happens to utilize it. I use it every day in my house to purify all of the drinking water that we consume. This way, not only am I receiving the added health benefits of drinking purified water now, but when a disaster happens there is no learning curve for me and my family to get used to using it.