This set offers a great deal it includes the popular 'rudd' preformed pond liner and the bestselling pondxpert tripleaction 2000 pump. A preformed pond is very easy to set up and install, making it a great diy project. Compared to flexible liners a preformed pond comes ready made so you don't have to worry about deciding on a size and shape to dig. Another advantage is that this pond has a perfect smooth finish whereas using a flexible liner can leave a pond with visible 'folds'. This preformed pond comes to you at a great low price 20% cheaper.follow the links for more information on these products br pondxpert preformed rudd pond br pondxpert tripleaction evolve 2000 br br saving made when compared to buying items separately.note due to its depth the preformed pond included is not suitable for koi.