Get a product called Combat Gel at the hardware store, home depot, lowes etc. It's an ant bait in gel form. Comes as a large plastic syringe. Just push out a few drops where the ants are active. Leave the ants alone - don't kill them. Let the ants feed on the gel. The ants will carry it back to nest, share with all and that's the end of it. Takes about 3 to 5 days to work. Works great! When you have ants in your house it usually indicates a satellite nest within the house! The satellite nest is collecting food and moving it outside to the mother nest.
Sorry be bit misleadin soundin to yual friend would pear these here inteligent folks be havin issues with ants be mighty troublesome may I just says that I have had ants in my room and they never seem to cause me any grief is all but sounds like i just be luck from nows on be swattin them dead as I be seein them cause I aint to be havin any problems with them. Sorry to have mis informed pilgrem. Good luck yur pouch fillin.
Ants are bad mojo in a grow, no question. Look for diatomaceous earth at most any garden store. Its a totally inert (and cheap) powder-looking stuff that is death to crawling bugs. Its ground up fossilized rock which acts as tiny razor blades to bug bodies. Its also used in swimming pool filters as a coating inside the filter unit.