$4 Weed & Grass Killer better than Round Up. 1 bag 40 lbs of salt from Home Depot $3.98. I put an equal amount of salt in each of the SIX 5 gallon buckets then filled the buckets with water. Put the buckets in full sun so they get warm, it takes 2 days for the salt pellets to dissolve into the water. Pour the salt water on grass and weeds that you don't want. Look at the photo, I poured salt water on this Bermuda grass and 24 hours later it is brown and almost dead. It won't be long roots will be dead too. I have done this before and it works best during the hottest part of the summer when plants need water because there is not much rain. I give plants a drink of salt water and they are dead. It will soak down deep in the soil and kill the Bermuda grass roots too.