In case your not in the know about Black Berkey filters they are the only gravity powered filtration sytem on the market (to the best of my knowledge) that meets the EPA standards to be called water purifier.
Here is an clip from Berkeys website. https://www.berkeyfi...specifications/ I'm not going to post here everything it filters out as it takes a lot of space with all the herbicides, pesticides, petrochemicals, dangerous metals, pharmaceuticals, ect...
But you should click and look, as its an impressive list.
Many water filters on the market may claim to be a purifier but do not meet the performance specifications required for this classification. In order to be classified as a water purifier, a water treatment device must remove at least 99.9999% of pathogenic bacteria (known as a log 6 reduction in the water treatment industry) and reduce viruses by 99.99% (log 4 reduction). Our Berkey water filter systems can be classified as a water purifier because the elements actually remove 99.9999999% of pathogenic bacteria (log 9 reduction) and 99.999% of viruses which greatly exceeds the standards.
Their complete systems can be quite expensive, but with a pair of replacement filters, and a pair of food grade buckets you can save your self quite a bit of coin for a very functional filter system.
It should be said that the filters themselves are expensive ($100-$120 a pair), but when you take into account that they filter 3000gal apiece the unit is good for 6000gal before you need to replace them. That works out to 4gal a day of filtered water for over 4 years, at a price of <$.02gal.
You only need two 5gal food grade buckets, and a threaded spigot like you would put on a water cooler.
Here is vid on how to assemble the system.