Laguna Water Basins provide the all-important foundation for your water garden. Water basins are generally easier to install than lined, in-ground ponds since their shape and depth are pre-determined. All you need to do is excavate an appropriately-sized hole. Made of rigid, heavy-duty polyethylene construction, the injection-molded water basins are designed to withstand all kinds of extreme conditions, including heavy water loads, hot summers, and frigid winters. Safe for fish and aquatic plants.