Hi,
Can someone please help me in deciding if a concrete circular pond 35 inches deep and approximately 2 feet diameter surrounded by 3-4 feet square moving towards the surface.

Would it be better to have a concrete or regular pond a circle surrounded by a square with a liner. What are the different considerations as far as maintance, cracks, stains etc considered? Would it be better if concrete is advice to tile it?

I would like a blue effect as afinal result, is it possible to do that with the liner method or am I being unpractical?

I would appreciate your feedback on this issue.

Thank you in advance.
Taz