Vinyl Liner and Armed PVC Liner

Yes they are the same, Vinyl = PVC (Polyvinyl chloride). Either installed on-site or manufactured off-site and install.

If you have the TOUCH collection they would have installed it on-site and cut/welded/stuck the parts directly in the pool. I considered using the TOUCH collection but ended up getting Persia Sand - ALKORPLAN3000 Collection - RENOLIT Alkorplan GLOBAL factory made and dropped in.
 
Yes they are the same, Vinyl = PVC (Polyvinyl chloride). Either installed on-site or manufactured off-site and install.

If you have the TOUCH collection they would have installed it on-site and cut/welded/stuck the parts directly in the pool. I considered using the TOUCH collection but ended up getting Persia Sand - ALKORPLAN3000 Collection - RENOLIT Alkorplan GLOBAL factory made and dropped in.
Yes, they intalled it in place like (very hard job). How long do you have the Persia Sand installed? Any issue?

My pool is one moth old and I see some very light black shadows on water line, I do not understand how can it happen, I brush the water line once a week.
 
It was installed in December 2022 and not had any issues since.

Not sure about the black shadows on the water line, do you have some photos of it? Do you have hard water/limescale?
 
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