oh Wow, that's Ants in your pool? I thought it was copper colored steel wool. I was like "well I don't know how that's related to ants..." HAHA
Wow. Sorry to display my ignorance of Ants floating abilities, but that's freaking nuts.
Ants love borax, and it loves
to kill them. I think my grandmother would put borax in sugar water, but I don't really remember. I just buy this little thing of liquid borax, they go after it like it's the best thing ever. and then....they go away. I've used it on all types of ants, except for fire ants. I killed them with fire.

, or Amdro. Seems to work until it turns dark brown in the container...then it's trash.
Terro Liquid ant killer. (1oz bottle). a drop or 2 will get em dead. (in all honesty, this stuff is great on small ants, and/or Sugar ants).
TO show how badly I don't want to kill things. I had this colony of fire ants, or maybe it was a few colonies. It was MASSIVE...anyway. I let them live behind my backyard for about a year. I didn't want to kill them if they weren't hurting anything. Then, those little jerks betrayed my trust and crossed over my fence to get to my dogs food I assume. The actions of a few led to the destruction of them all.