Hi Loftus
One pointer that may help from past pool shoots is to make sure that the water is clean as many pools are very, very dirty! This can be especially apparent using lights in low light or at night and it really will look awful so make sure the pool has been cleaned just prior to the shoot. Is this an indoor pool or are you using lights in daylight? Even powerful lights in daylight will have very little effect in a shallow pool. I've been involved in green screening on a pool shoot with varying success, but if you are going that route then your lighting needs to be spot on and your camera really needs to be recording at a very high bitrate to pull it off successfully. AVCHD/HDV wouldn't really cut it and I doubt HDSLR codecs would fare much better.
Hope this helps!
Cheers, Simon
Thanks Simon.
Yeah, as they say cleanliness is job 1. I have an outdoor pool so I have to be quite intense about cleaning prior to a shoot. I run my filters for 48 hours before a shoot. I also have a second above ground filter that I use before shoots. I've become quite a pool boy since starting this stuff.
I plan to shoot late afternoon, early evening with video after I am done with the still stuff. I guess I can't turn up my shutter speed to darken the background using continuous lighting. 
I plan to shoot with the D7000 DSLR, so any particular settings advice is also welcome. (unless someone with a high end camera wants to show up.
I also am not planning to do very wide angle stuff so I can keep my water distance as short as possible to minimize dirt etc and amount of background. Probably shoot Tokina at the 17 end or 16-35.
Unfortunately no spotting like with stills I know.