I have an in-ground pool with tiles at the water level. One of the tiles fell off about a year ago, but I didn't fix it thinking that it wouldn't affect the structure of the pool.
Then a few of days ago, my daughter pulled the tile next to it and it fell off too. And while checking the wall behind those two tiles, I found a horizontal crack on the concrete wall. The crack runs behind other tiles and I can't tell where it ends.
And it looks like water is leaking through the crack. I added water to the pool so that the water level is about 3/8"-1/2" above the crack yesterday morning. When I checked this evening (about 30 hours later), the water was at the crack level. The high temperature for yesterday and today was mid 80s.
What is the best way to fix this? Will I have to fill the crack? If so, what should I use? Should I remove other tiles as well or can I just put those two tiles back?
If I don't fix it now and just keep the water below the crack level, will the problem be worsened (like crack will get bigger/longer, more tiles will fall off, etc)
Also, the pool is right next to the house. Can the water leaked from the pool affect/damage the foundation of the house?
Thank you. I'm a total newbie and not handy at all. So any tips would be very helpful.