We recently moved into a house on well water that smells VERY strongly of hydrogen sulfide (sulfur), which as I understand it is relatively safe but to me completely unpalatable. After a lot of research I settled on a Berkey, even calling the companies that do their testing to make sure they were real tests. I haven't tested the filtered/purified water since our well water was tested to be safe from bacteria but I can say it takes out the sulfur smell and taste.
The frustrating part: it clogged within three weeks. I performed a red dye test and it passed, and was helpful because it showed me one of the white plugs was leaking. But after 2 1/2 weeks of probably 5 gallons per day it slowed to an occasional drip when it got down to about a gallon in the upper chamber. I removed the filters and scrubbed them down with a non-abrasive scotchbrite pad. That sped it up a bit, but it's still very slow. I assume I need to scrub a little more. I'm planning on getting a pre-filter of some sort since I found a coating of sediment in the upper chamber. I have to pull my water from before the water softener (I believe according to Berkey softened water going through the black elements voids their warranty) so it has no filter from the well. I had to do it a second time about 2 weeks later, too.
Otherwise, I would recommend it- with the caveat that it could be doing nothing other than changing the taste (and the taste is very good). But at some point I decided to trust the posted tests and various YouTube reviews.
Both of the black elements came with small chips (maybe 1/4" by 1/8" off the top edge of element) that I figured didn't matter, but it did annoy me.
I highly recommend the sight glass to go along with it.
I fill it to the top every time so I get the most filtering capacity out of as much of the filter as possible. I wish they would make them able to flipped - add a second outlet on top and have a plug for it. Otherwise the bottom half of the filter gets used mu...