I like your cynicism!!!
Sometimes I hate typed words, I was being more sarcastic about knowing people who work there. I do, but that doesn't mean that they developed the product or know 100% about the manufacturing process of an item and I wouldn't take my or there words as fact without doing my own research (until I read your reply I thought I was the king of cynics).
I certainly don't want to be the guy defending this or almost any product, but in the interest of me being right ;-) I have a link to a pdf file that contains the ingredients:
http://www.pgproductsafety.com/produ...r_Original.pdf
It say's ingredient Melamine Polymer and purpose abrasive foam, but please check it out for yourself.
If you find that it doesn't contain anything other than the Melamine Polymer, I can definitely say it would work great for cleaning off steps, or fences around pools. But like I said earlier they do end up shredding and it is very similar to a pencil eraser that is coming apart.

On another note, Thanks for all the info and help you guys provide! This is my first pool and from the get go I have been utilizing your methods with the pool and everything (other than some high PH and TA that I am working on with muriatic acid) everything has been simple, easy and effective!