Just openned after 4 years 340 gallon spa.
Went thru decontamination process..purge and superchlorination to 70ppm.
I am in the process of increasing CYA with dichlor (27 of 34 ppm of dichlor)
Starting seeing yellow spots stains on control panel. See pic.
Fc : 10 (to much dichlor today)
Cya 24 ( based on dichlor added)
Anyone have any idea?
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