So, bought some Boric Acid, mixed it 50% with sugar... Nothing happened, one(!) ant came out to check it, then I realised "Hey, maybe I forgot something?" Yep, water. I mixed it with water to create a nice "syrup" - TA-DAA! They came out in hundreds and hundreds!!! They ate for about 1 hour, and then dissapeared... Now, 3 days later... No ants whatsoever. I have left Zuco, strawberry jam and sugar mixed with water just to see if they are all gone. NOT ONE SINGLE ANT!! And all it cost me was 3 pesos, how about that?? Thanks to all of you who suggested Boric Acid - it workes like a charm!