I agree that a company that won't give their physical address 'sets off alarm bells' !

I checked out their site and the info they give is ~ OK. (I doubt that a 5 HP shop-vac would be enough to set even a 16 X 32 pool and their recommendation to have 200 ppm calcium in a liner pool is BS)

It's a nice primer on how to drop and maintain a liner pool but I'd advise anyone DIY to check here first!

As you well know, every pool is unique - writing a 'definitive and fully complete' "How To" set of instructions is ~ impossible! (I've tried )