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Thanks for the reply and information, Bruce. No copper has been used - that purple tone is an artifact of scaling down the pictures to a size that will fit here on the board. There's no hint of purple in the pool or at the tile line.

Our pool is just under a year old. The plaster is a "medium Tahoe blue", meaning it is grey. Took some pics with an underwater camera today and had a couple of questions: there's a lot of mottling of the color throughout the plaster. Is this hydration staining or just an artifact of the color...

I will lower the TA using acid and aeration...sounds like a plan. I use the LaMotte kit. I've tested it against my TFP kit and I don't see any difference, which leads me to believe the unit is accurate... and it's much easier and less subjective for my eyes. Will see if lowering the TA does the...

First off, let me say, like so many others: this site is awesome. The knowledge and support is incredible. New pool owner here: in-ground gunite, with fill in January, 2009 My numbers today are: FC: 1.96 TC: 2.21 PH: 7.9 TA: 114 CYA: 51 Cal. Hardness: 510 CSI (at 68 degrees): +.7...

First off: I'm new here - I've been lurking for months while our pool (first one, ever, for me...) has been being built. The comments and advice on this forum are awesome.... The pool now has water in it and we can't wait for the weather to warm up for our first swim! We're using the spa for...