Floating island with water-purifying effect, plant-cultivation bag and method for purifying water

摘要

A floating island with a water-purifying effect of the present invention has a floating body (11) and an agent container (12). The floating body (11) includes a planter (3) made of a foamed resin, soil contained in the planter (3) and plants (6) planted in the soil. A plurality of openings (32) are provided in the bottom of the planter through which water is supplied to the soil (5) in the planter (3) and roots (61) of the plants grow into water. The agent container (12) stores an oxygen-generating agent (2) therein, which is attached on the outside of the bottom of the planter.