Blue Stains

[JonnyG]

Hi All,

I have some blue stains in my swim outs after opening the pool last weekend. My chlorine tests show no algae present so I am thinking these are metal stains. Can anyone confirm?

FC:15
CC:0
CYA: 50
ALK: 90
PH:7.5
CA:200

Thanks
JP

[BigDave]

Do you have any sources of copper in your pool? Perhaps from copper-laced chlorinating products or mineral or ion systems?

[JonnyG]

No, I have never used such items, only BBB. The only source of metals is the original fill of pool water where I topped off the pool with my hose linked to me home water softener which went into regen during the fill and dumped some metals (including iron). But that was 6 years ago and I do not ever recall seeing blue spotting on the walls or floors.

JP