Years ago I made a 4'x6'x1.5' goldfish pond. I dug the hole, put in the liner then put two layers of bricks around itno concrete pad for the bricks to sit on.
It has lasted and been beautiful for 17 years.
Now, I want to redo it the correct way.
Do I rip out the bricks and lay a formed concrete pad? Or could I frame around they existing brick, fill in with concrete, then add a new liner and two more rows of brick?