Great article! So true, I like the way you sourced everything at the bottom. Keep up the good work. Berkey sells some great replacement filters. 2 stage drip- activated charcoal to secondary fluoride and arsenic. Their filtration systems are kind of pricy so I used two food safe buckets stacked with Berky guts, drill a couple holes, add a spigot, and you're in business. Tap water goes in the top and then comes out the bottom fluoride free.