Shit yes i used to cool a water cooled computer with one(a pool that is)
If you are concerned about corrosion you could build a closed loop system by getting an old car radiator and submerging that in the pool (near one of the jets for circulation) and then running a hose to the "ice box"
as you can tell I am a bit of a macguyver type myself and will post the question of why dont you diy one yourself. All you need is a heater core from say a 1989 ford f150 (my favorite for water cooled computer radiators) they were running about $16 from checkers a couple years back (my freinds liked ones from an old chevettes). then you just need to get a small plastic box that fits the heater core and your ducting?
http://shop.ebay.com/i.html?_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A2648&_nkw=heater+core&_dmpt=Motors_Car_Truck_Parts_Accessories&_sop=1&_trksid=p3286.c0.m14
or
http://www.google.com/products?q=heater+core&hl=en&scoring=p
heater cores are awesome because they have very little resistance on both the water and the air.
What I dont quite understand is how is this supposed to work it seems like you would need like 2-6 of these to suck the heat out of the air from even just a couple of lights. let me know if it works!