So I started 3 yrs ago with a preformed...last yr at the end of the summer I dug out a 1000 gal pond with liner....Didn't finish it for some reason......I figured out why this spring.....I WANTED BIGGER...So my hubby and I dug out a 4000 gal pond and im in love. It is still in the construction faze and not very pretty yet but I will have that done as soon as I get a min. But all macanics are done except for the monster uv light I broke and am waiting on parts to ship....Cant wait for the pond place down the street to get pond plants in. Only 2 of mine survived the winter...