The severe white discoloration in this pool appear to be caused by improper plastering workmanship. I don't consider this normal mottling.
An acid treatment is not going to effectively remove the white spots and streaks. The appropriate to remedy this is to power sand and polish the entire pool. It will take a lot of sanding, and IMO, the plaster contractor should perform that work for free.
@onBalance - thank you for the reply. so i assume trying to go with a calcium build up type removal will do nothing either? i will reach out to the plaster contractor and see. it has been a little over 2 years, so i can only imagine it will go nowhere but we shall see. any chance you can give me an idea of exactly what they did wrong so when I talk to him i could give him some specifics? thanks again.