blue crystal stains on plaster

[mdswimmers]

We have a 1 year old gunnite - plaster pool. I am getting blue crystals forming on the plaster. Sometimes they are in spots, and sometimes they are in veins. They are rough to the touch. I had my water checked, and they said everything is normal. The plaster around the crystals is white with a dingy brownish color surrounding that. It is spreading fast!
Cholrine 1
pH 6.8
Alkalinity 80
Cyanuric Acid 30-50
What can I do?

[aylad]

I don't know about the blue crystals, but you definitely need to get your Chlorine up to a minimum of 3, and raise your pH to at least 7.2...

Janet