Viatera? is comprised of 93% quartz, one of the hardest minerals on earth, giving the material the superior strength to stone. Viatera? is seamless & non-porous without crevices or surface irregularities where harmful bacteria and mold may reside and does not require a regular application of sealants or waxes. Viatera? is environmentally friendly, supporting a greener earth by using sustainable material and an eco-friendly manufacturing process. It is NSF (National Sanitary Foundation) and Greenguard certified. Viatera?comes standard with a 15 year transferable warranty.