I have never done it before, so I need step by step directions in removing an old blanco single handle faucet and now putting in the new one

No you can not remove them, if you try to dill out the water saver you might do damage to the faucet.

Sorry next time you buy check the G P M flow rating.

Best of luck Rich

Unscrew the part where the water comes out and remove the enterior parts paying close attention to how and the order in witch the come out so you can clean everything good and put it back together and pay close attention to the twist switch and how it operates. This shought fix the problem your having.

If the screw you have removed is a set screw then you shuold be able to remove the handle. If it has been on there awhile you may need to pry on it with the handle in the full open state. Use something that will not mar the handle.

Try this useful specs from Blanco ---->LINK .

You need to turn the water off under the sink. Disconnect the sprayer hose from the threaded shank under the center of the faucet body. Pull the spray head out of the faucet. Contact Blanco to receive your faucet parts free.

If you mean the top faucet handle, there is a small round plastic cap. You need to remove this and then remove the grub screw, handle will then pull off. Hope this is what you meant, if not post again. Thanks Paul.

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.

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

Try removing cap of knob and tighten screw it could be loose. If that is not it it may need a new seal ring.

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.