6ft should be far enough away so that you do not affect the integrity of the pool. However, I would urge you to consider a standard pond with waterfall. One that has plants, fish, etc. They are very low cost if you DIY, cheaper than the pondless waterfall kit that you have shown in your link. They are also almost no maintenance once set up and become an incredibly enjoyable focal point in your yard. I have one within a few feet of my pool.
http://i36.photobucket.com/albums/e4...61600x1200.jpg
http://i36.photobucket.com/albums/e4...ab/Pool304.jpg
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