I have two spots in my pool that have a leak from behind the tile in the grout line. The pool builder attempted to fix this by putting some kind of sealant in the grout, but didn't work. Pool builder is saying it's calcium leaching through the grout. His suggestion was to scrape the area out and regrout. I'm concerned if there's moisture leaching through it will just find the next weak spot to leach next. Any one experience this before and more importantly, how did you fix it. I've attached a pic - and grout line needs a good scrubbing, will do that once I'm back in the pool (it's about 70 degrees now and a bit too cool for me to get in quite yet ).
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