Hmmm, that's weird, because quartz doesn't need sealing, it's non-porous. Perhaps your installer offered to seal it to reassure you, but that's simply not something that it's done with quartz. It's a man-made stone, very durable, very strong, and easy to maintain. Granite needs sealing once a year, for example. I would talk with the installer once again or find another one. I'm not familiar with Della Terra Quartz but with MSI Stone and Caesarstone I have only the best experience, I highly recommend them.

While most Della Terra Quartz i safe for food contact, they do make 13 colors that are certified as "splash zone only." (i.e. unsafe to use in your kitchen). So when selecting a Della Terra color for your kitchen, be sure to check that you haven't chosen one of those 13 colors:

http://info.nsf.org/Certified/food/Listings.asp?TradeName=quartz&;

Stick to MSI or Caesarstone please. Neither needs any sealing in any color for safety or maintenance.. DO try to stay far from deep colors ( the grays) in Caesarstone. Not a food safety issue, just prone to some spots..........sometimes.

MSI only makes 10 colors safe for food contact. All the rest are for splash zone only (i.e. bathrooms). Do your research before chosing an MSI color. (Listed on NSF database as "M S International")

All colors of Caesarstone are safe for food contact, except for their "Himalayan Moon" color. As long as you don't choose that particular color, you should be fine with any other Caesarstone choice in your kitchen, food safety-wise.

I honestly can't think of a food stuff that sits directly on my counters. ............: ) I really can't. Not even fruit with a skin.

We've had a great experience with Quartz Master, as well as with Caesarstone and MSI. No complaints from our customers whatsoever. And no need to seal quartz slabs, ever.

Not sure what role your installer has for the counters; but I would talk to the fabricator as they know what works with what they work on.. Quartz does not get sealed in general.

Before even doing that really make sure you LOVE how your kitchen functions, replacing counters only adds the pretty not improved function and a huge cost at that.

Our CAMBRIA Quartz Countertops are now 10 years old and the section in front of the window is fading (turning whitish). BEWARE!!!

UPDATE: CAMBRIA does NOT honor their Warranty if it is UV (that is Light) damage.

This is great information regarding "safe for food contact". I had no idea!