I got pretty hot planting spinach for over winter so I decided to go swimming in my cement pond. Its been 7 years since I made it and its still in really good shape despite freezing weather in winter. I did everything myself and it cost a little over $600 to make. Its pretty large too, 52 ft. long and 32 ft. wide and 11 ft deep. Its made of chain link fence and chicken wire covered by about 2 in. of sand-cement mix. It has six ft. wide plant zones on each side that keeps the water clean if I keep the pumps going. Check it out. Thanks for watching and God bless.