Hot Tub Gray Plastic Turned Gold Color

We noticed that most of the plastic fixtures in our hot tub, naturally gray in color, are all coated in a gold color below the waterline. My wife performed a routine chemical treatment yesterday, including adding pH raiser and Alkalinity raiser. A chem strip shows normal levels.
Any idea what this is and will it resolve?
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Have your water tested. Sounds like some sort of mineral problem. You might want to look into a water softener.
Or this: http://www.askalanaquestion.com/mineral_spa_problems.htm
I haven't tried it but it claims to be an alternative.
Jim
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