Excellent product for a small yard fountain such as the one I installed. The water reservoir I created was 4'x 4' x 1' with a small pocket for the pump. It worked out ok and a nice looking fountain. It was a good thing the sun was out, this product is PVC and I used the sun to warm the liner before it would conform to the shape I needed. Just keep in mind this product is only 20 mil thick, most coy ponds use 45 mil fish safe EPDM liner material. So, I don't think I would use this product for a coy pond unless I had the ok of an expert. Almost forgot, I measured the liner, like to know if I got what I paid for, and the width was 4" short of 8' and the length was dead-on at 10'. Interesting!