I contacted exterminator's "here in canada", they were all charging 400$-700$, to do what ?, come to my residence and place ant baits.
Well i took a chance , and tried this, and it works, the pharao ants went into a feeding frenzy for a couple of days, then went away and came back for another round 4-5 days later, after a 3rd and final feeding frenzy, i could see they were much less ants.
Its been 4 weeks and this colony seem to be completely dead.
Here's the best tricks, to get rid of pharao ants at least.
Dont disturb them with chemicals or anything else, otherwise you will just make things much worsts.
Follow them and see were they disappear in a crack or hole somewhere. Place a bait about 8-10 inches away from the whole, so you can observe them carefully.
What i did to attract them rapidly to the bait, i poured a couple of drops next to the bait feeder, they went for it within 2 days.
If you have kids or pets, be careful, where you place and use these things. Specially pets, they will be attracted to the bait and lick it because its very sweet, and its enough to be harmful to them.