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Looks a lot like mine. Slight chemical etching of the pool surface coupled with metal deposition. Used to have a Frog system. System continuously suspended metals in water. Thinking it was some form of mold, added more chemicals (most metals based). Bounce when shocking, as recommended by...

Thanks for your replies. Just catching up. This has been an on-going issue for probably the last 3 yrs. It has never cleared. Test results from this morning are FC 6.5, CC 0, pH 8, TA 80, CH 250, CYA 90. Pool tends to run pretty consistent. Texas Splash - It’s not copper. Though there is...

I and several pool guys have been stumped for years. Hoping some crowd sourcing can dredge up new ideas. Five year old in-ground pool. Started with a Frog and mineral system. Terrible results. Converted over to TFP recommendations over a year ago. Water is crystal clear and well balanced. Chem...