Ant invasion

Since I moved into my new place I've been fighting ants wanting to come hang in my kitchen. There is a door directly going outside and the problem is that it's completely flush to the outside. So ants don't have any obstacle preventing them from joining me in the house.
After trying to use sprays I had to resort to the heavy stuff: poison chalk and killer powder! I wasn't sure they were going to work, but boy was I wrong.
I treated the entire area almost 3 weeks ago. Since then everyday I am brushing off dead ants! It's like it's a never ending supply!!
While I was gone for 6 days on a business trip no one cleaned up the ants. Check out of the photos. They are pretty graphic!!
Âmes sensibles, s'abstenir!!