The Big Berkey water filter is a gravity filtration setup that uses gravity to push unfiltered water through filters and into a clean drinking water chamber.
I believe water distillation is superior to any form of water filtration, even a super nice gravity filtration setup like the Big Berkey. For the best home water purification, I would have to recommend a water distiller countertop unit like the MegaHome. I wrote a review of the MegaHome Countertop Water Distiller here:
That doesn’t mean a gravity filtration setup doesn’t its place. I think gravity filter systems are incredibly valuable in survival scenarios where you don’t have electricity.
You can find the Big Berkey water filter here:
The Product Testers