Waterline tile is usually the first thing to fail. Replace it for a modern look while you're already draining the pool — or as a standalone fix.
St. George's hard water leaves calcium deposits at the waterline. Over time it builds up, traps stains, and eventually pops tiles loose. Freeze-thaw cycles in colder winters speed it up.
If more than a handful of tiles are loose, if the grout is failing in long sections, or if heavy scale won't come off even with bead-blasting — it's time to replace rather than patch.
Drain to below the tile line, chip out the old tile and substrate, install new tile and grout, seal, refill. Often bundled with a resurface so the drain happens once.

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Sometimes, if it's a few tiles in one area. But if you're already draining for a resurface, it's almost always more economical to replace all the waterline tile at once.
Standalone job: $1,500–$4,500 depending on tile selection and how much remediation the substrate needs. As an add-on during resurfacing: usually $1,500–$3,000.
Better than old tile, but St. George water will scale anything eventually. The fix is maintaining your water's calcium hardness and pH within range — and an annual brush at the waterline.
Not required, but if your tile is more than 15 years old it's the most cost-effective time to do it. The pool is already drained.
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