That only kills the ants you see. You might kill a hundred ants, but there are thousands more back at the nest... Where there's a queen.... Who spends her day laying eggs, drinking tea, and proclaiming "Let Us Eat Cake". They've got an entire nursery going there, with ants whose only job is to tend to the eggs. And worker ants, who are busy as bees, constructing new chambers... digging new tunnels... and carrying stuff out of the nest. There are solider ants, who are kind of like bouncers at a night club... telling ants from the wrong neighborhood to get the hell out, and pulling back the velvet rope for the beautiful ants, without even stopping to ask them for I.D. The key is to get those beautiful ants to carry bits of bait into the nest to feed to their friends, and give to the R.N. Ants tending the incubators in the nursery.
Ants build nests in all sorts of places.... They dig in the soil. Live in dead and decaying trees, under piles of leaves, in the moist dark recesses under your house, in the walls, in the ceiling, in your aunt Zelda's smelly old Camel-back Sofa, and in the back seat of that old Buick you've got hidden behind the garage under a blue tarp. If you can find the nest, you can drench it with an insecticide like imidacloprid or Bifthren, and you can spray the soil and foundation around your house, which will form a physical barrier. But you really need to apply a bait. Find a good Granular Bait that you can sprinkle around the outside of your home. The stuff comes in jugs, and looks like ground corn meal, or sawdust.
Amdro makes a great product, but I don't know whether it is available in Austrailia. I'm sure there is something similar there... http://www.amdro.com/
Those Gel Bait Traps that you've got scattered around your house dry out really fast. You need to constantly replace them, or they're nothing but useless pieces of plastic gathering dust. Terro makes a great liquid product in a plastic doohickie that you cut open, and shove into the dark recesses. It has a little ramp, and a pool of liquid bait behind it. I like them because you can see that bait. And when it dries out, you can see that it has turned into a lump of crystallized stuff that is no longer attractive to ants, or you, or anyone else, and you can throw it out, and replace it with a new bait station.
Don't let your dog drink the stuff straight from the jug, and keep them away from any area you've sprayed, until it has dried. Do you ever give your dog a flea bath? Or apply a product like "Advantage"? The active ingredient is imidacloprid. How about Frontline? They use Fipronil.... another great ant killing product. Bifenthrin could be a problem for your pets... let the sprayed area dry before you let them run around in it.
Well what about in Mississippi? Are you handy in Mississippi? If not, I suggest you give a local pest control operator a call. But... my experience is that the cost of all the chemistry I've got sitting on the shelf out in the garage is less than the cost of one visit from the pest control guys. And... that stuff is going to last for years. Can you use a measuring cup? Can you turn on a garden hose? Can you read? I don't know what the equivalent of Home Depot or Lowes is in Sydney, Melbourne, Perth, or Jacks' Place, but I'm sure you can find a big box home improvement and wallet depletion store with a garden section and a pest control aisle. There's bound to be someone there stocking the shelves and answering questions... They can help you fill your basket or buggy with products that you can put in the trunk or the boot, and haul home to mix up, spray, and store in the garage or garden shed.
Get yourself a garden sprayer...
Buy the appropriate liquid concentrate to mix up and spray...
And get to work.