What kind of liner should I usepreformed or flexible?
Most often the flexible liners are less expensive and more forgiving, i.e. more adaptable to different sizes, depths and site conditions. Preforms sometimes work better as formal ponds, indoors or inside decks, but they are not easier to install. Preforms are also more difficult to filter or skim and are usually too shallow to overwinter fish well. Remember, the smaller the pond the more quickly it heats up and cools down which can adversely affect fish and plants that prefer a more stable environment.
