Walls of oval pool starting to bow out

[kwazy]

So, would a buttress-free oval pool have been a better choice, or do they have other problems?

[matt4x4]

same issues, it's the nature of the beast with oval, there are different forces acting on it in comparison to a round pool - read my explanation of them at:
http://www.poolforum.com/pf2/showthread.php?t=7665