Abstract: According to some examples, a coverable pool structure having a membrane for containing a liquid, the membrane having a bottom wall, a peripheral wall extending from the bottom wall, and a top edge on the peripheral wall, a rim connected to the peripheral wall proximate the top edge, a flexible covering member being positionable so as to extend between the peripheral wall to inhibit access to the liquid, an attachment apparatus for securing the flexible covering member to the rim, and a support member positionable between a top surface of the liquid and the flexible covering member and configured to bias at least a portion of the flexible covering member away from the liquid.