You might not see a lot of travertine perhaps because the stone is not readily available in the LA area. Travertine comes from ancient calcium carbonate deposits from surface waters and hot springs. CA is not known for producing travertine. Rocks are heavy and expensive to transport therefore it is likely cost prohibitive except for the uber-rich (think Hearst Castle) to install natural travertine. I sincerely doubt acid rain has much to do with the considerations.
Sent from my iPhone using Tapatalk,16k gal SWG pool (All Pentair), QuadDE100 Filter, Taylor K-2006
