It is also a food source for fish. Top of containers should be 3 to 6 inches below water surface. Fertilize once a month. Each water lily can be substituted with 3 potted water poppies or 3 water clover. Pump o Check specified filter flow rates.
Filters remove fish waters, sediment, and algae, which help keep the pond balanced.
Use only pond water to clean filters. Once the pond is in balance, you should only need to use them to control occasional problems. Algae does not harm plant life or fish in your pool. Keeping by Dr. David Pool. Low Maintenance Water Garden by Helen Nash.