On 5/29/2014 12:13 AM, Danny D. wrote:
Mine, which can be seen dry here, is a gray color which has
somehow turned a whitish blueish greenish from something,
perhaps algae treatments and/or calcium deposits?
https://c2.staticflickr.com/4/3750/1...bd17ae83_b.jpg

What is the hardness level of your well water? I've been told hard-water
causes mottling. The cracking? I'm not sure, but it could be related. I
think the only thing you can do is refinish and don't use hard water.
(got $5 to $10 grand to spare?)

Hopefully someone else has a cheaper idea.