Seahunt Posted July 6, 2009 Report Share Posted July 6, 2009 What is this? It showed up again this year. I believe it started below the water line but it is now above it. I have several spots. I raised my Calcium Hardness from 170 to 270 when it first started showing up. Don't know if that is the right thing to do. Any advice would be appreciated. I have a 22k gal in-ground concrete pool. Quote Link to comment Share on other sites More sharing options...
billp Posted August 10, 2009 Report Share Posted August 10, 2009 Is that a shadow or a stain on the plaster? If you are asking about the scale on the tile I suspect leaching from behind the tile. Scrape it off with a putty knfe, see if it returns to the same place. Can you post a pic from farther back? Quote Link to comment Share on other sites More sharing options...
4serendipity Posted September 2, 2009 Report Share Posted September 2, 2009 What you are seeing is called effloresence and this is a result of sodium leaching through the mortar used in setting the tiles. Specifically the lime used in the tile setting preparation promotes this crystaline growth. This is a problem that VERY few people have actual answers to. The only method that I have ever used that will actually reduce the amount of effloresence bleeding through the concrete is to wash on a weekly basis with 10:1 diluted vinegar. The only way to actually prevent effloresence is to reinstall all the concrete surfaces without using hydrated lime and by washing with concentrated vinegar before tiling. I hope this information is helpful. S Quote Link to comment Share on other sites More sharing options...
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