Right now Im using a 150 gallon stock tank that is sunken into the ground for my duck and goose to swim in Im planning on taking the stock tank out and instead using it for a filtration system for my fish pond. The problem with the stock tank is its very deep and not so wide so they don't have much room to swim around in. Its got a drain on it and it seems just the right shape to be perfect to turn into a filter for my small pond. Im thinking of either getting a very large kiddie pool for my duck and goose to swim in or a preformed liner. If I used the kiddie pool I would get a very large on like this http://www.brandsonsale.com/itx-56453.html If I did the preformed pond liner I would use something like this http://www.homedepot.com/Outdoors/h...splay?langId=-1&storeId=10051&catalogId=10053 Im not sure which one would be better. Obviously the kiddie pool is much cheaper but it also probably wouldn't last as long. The pond liner is better looking and longer pasting but is much more money My plan is to sink the pool into the ground like I did with the stock tank and then make a filter out of a bin with pea gravel and plants growing in it. The water would be pump into the bin and then flow out clean again. So what would you suggest, kiddie pool or the pond liner?