my bro gave me another idea, what if i use wood (4"x4"x8'), to make a 8'x4'x3' pond, then use those concrete backer boards, screw it up good, caulk the joints and tile it and grout it using cement
OR
Use bricks (i dont knwo the price of a mortar brick cant find it online) and then use mortar to make a 1/2inch thick plaster on the walls... lets say i had to sell my house i could use a sledge lol

OR
Use bricks (i dont knwo the price of a mortar brick cant find it online) and then use mortar to make a 1/2inch thick plaster on the walls... lets say i had to sell my house i could use a sledge lol