Caulking over grout?

Mar 9, 2016
9
Phoenix AZ
My interior company presited the pool and suggested putting clear caulk between the TOP of the pool water tiles and the UNDERSIDE of the travertine coping. It is already grouted properly and looks nice. Is this needed or beneficial? They said it will save me from issues down the road.
 
I could see it as a seal to keep black algae out of there but it does seem a bit overkill to me. I am pretty sure I would do a colored caulk rather than clear but I am also pretty sure I wouldn't do it in the first place.
 

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