- 1). Use a hose to create a siphon in the pond by thrusting it forward and backward underwater, which will begin draining the water.
- 2). Drain about one-third of the water from the pond.
- 3). Refill the pond with fresh water, making sure that the temperature approximately matches the water already in the pond.
- 4). Scatter water lilies over about two-thirds of the surface of the pond. These will block sunlight and absorb nutrients that the algae would otherwise use to propagate.
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