Read here about how Ovopur's shape helps it put gravity and circulation to use, imitating nature's filtration of water. Everything about the system is aesthetically pleasing: from the egg-shaped ceramic reservoir to the reuseable glass filter. This water filter could definitely find a place in our homes, as it's much greener than bottled water or other filtration systems, it's cost-effective over time ($0.07 per liter), and it is just plain beautiful. That's the Ovopur's filter cartridge to the right. It's reuseable to an extent, but has to be replaced three times a year. When the time comes, send the used filter cartridge to Aquaovo. They're recycle the old one and you'll receive a rebate on your new cartridge. Here is more info on purchasing an Ovopur filtration system.