Gravity Water Filtration is one of the simplest and most effective ways to get clean and safe drinking water without the need for electricity or complex plumbing. In simple word, Green-Tak offers advanced gravity water filtration systems designed to provide pure, great-tasting water for homes, offices, and outdoor use. One of the biggest advantages of Gravity Water Filtration is its portability and ease of use. You don’t need any electricity, water pressure, or complicated installation.