Tried rock salt to remove weeds around a cicular gravel driveway .

I would be concerned by bacteria or other ??? using sea water might introduce into your soil. What about making a concentrated salt solution and apply it with a fertilizer feeder hose.

Give up on being green. Poison the Hell of the damn weeds.

Get a one gallon garden pump sprayer. In a large pot of your stove, mix 4 cups of table salt and 8 cups of water. Heat just until the salt dissolves completely. Pour the mixture into the garden sprayer. Add 3-4 drops of liquid dish soap. Mix the liquid to combine everything well. Add enough additional water to fill the sprayer. Now, spray the weeds with this mixture during the heat of the day. Make sure it is not going to rain for a coupe of days. In 2-3 days, you will see the weeds drying up and dying. Be careful not to get this mixture on any other plants as it will kill them as well.

I agree with Lin - sometimes you just have to bite the bullet and go with the chems! But make sure you READ THE LABEL before applying. The no name stuff works just as well as the brand name - you know that "round" stuff.

One word - Vinegar. Needs to be applied after rain or snow, but it works, is environmentally friendly and inexpensive.

I believe in vinegar, it is inexpensive and easy to apply. I use a water sprayer and must be careful around plants you want to keep otherwise the vinegar will kill them too.

Once you fill the area with salt, you'll have a tough time growing anything there for a very long time. I wouldn't use salt.