Pebble tec at waterline ?

Welcome to TFP.

The waterline gets scum and scale. It is easy to clean smooth tile. It will be very difficult o clean the nooks and crannies of a pebble finish.
 
I do not have a pebble surace. My sister does though, and on her beach entry there is a line that has formed. I will not however, vouch for her water quality.

That said, Pebbletec discourages the practice. See various comments on page 3 of this pdf.

https://mmgtx.com/docs/PTI_Design_Construction_Guides(3).pdf
 
I would do a search on that here. I know I have seen a thread on here where someone had done that and, after time, the pebble above the water line started to crack. I would use tile at the water line in my opinion.
 
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