I am unable to turn the lock nut under the sink on my Blanco, single lever kitchen faucet. I want to remove the whole unit. Any suggestions?

SOURCE: Leaky Blanco Single Lever Kitchen Faucet with separate sprayer

You only need one small o-ring. If you put two of them it will not work properly and will mostlikely leak like crazy. If this helped please rate.

SOURCE: Leaky Blanco Single Lever Kitchen Faucet with separate sprayer

you can call or e-mail the company, if the faucet is the one in the picture it is a single cartdridge, turn of bith hot and cold water, take an allen wrench into the little plastic cover to remove the handle , unscrew the top cover or it might pop off, that there is either a large lock not or 3 screws holding down the cartdridge, take it out replace it put some faucet frease around all rubber gaskets then install it in the smae way it came out

SOURCE: remove water saver device from Blanco Grace kitchen faucet

Remove the aerator at the end of the spout. It will unscrew and once off it will have a dime sized restricter in it that can be removed this restrict's the water down to about 1.6 gpm to save water.
It will either be plastic or metal and about the size of a dime with a small holw in it to let water pass by maybe 1/8" hole just remove it and put aerator back together.

Clean aerator screen out before you put it back together.

http://www.plumbersurplus.com/pdf/07163.pdf This link has a breakdown of parts. Look at parts 8b-10 for aerator breakdown.