Light niche ring rust spots

Mikekelly

Member
Jul 26, 2021
9
Las Vegas
Pool Size
20000
Surface
Fiberglass
Chlorine
Liquid Chlorine
Hello. Had my pool finished about 6 months ago and noticed my light niche mounting ring is showing rust spots… what would cause this?
 

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Welcome to TFP! :wave: While there is always a possibility the material itself may be bad, the first area I would look at would be the water chemistry. Do you have a TF-100 or Taylor K-2006C test kit to post a full set of water test results?

 
Hello. I have the pentair test kit and the LaMotte copper test kit. When they installed the pool they sold me on copper ionization. I will do a test of the water and post results
 
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