It’s wrong to assume that all algae is bad for your pond. When kept under control, algae is desirable: it provides oxygen and food for the fish, and improves the appearance of your pond, making it look like a truly aquatic environment, not just a manufactured pool. Problems arise when algae spreads, taking up the space that the fish and the other plants in the pond need for growth. Key Factors That Affect Algae Growth
Organic debris from fish/plants/external sources that collects at the bottom.
High concentration of nutrients in the water, often found after winter, when the plants and the fish are less active and don’t consume them as much as during the warm seasons.
Lack of natural bacteria caused by the poor quality of water, which can be the result of poor filtration, or lack of maintenance.
Tips For Fighting Algae
Install an aerator or waterfall to keep the water agitated. Bad gases will be released from the pond, and oxygen will more easily reach the water.
Use a good pump and filter. The pump moves about half of the volume of the water; a filter removes from it the byproducts of fish and other bad substances resulting from dead plant life. For a new pond a conventional filter is usually a better idea than a biological one, since the latter requires months before it brings major benefits to your pond. Barley straw also helps improve the filtration of the water.
Use Pond Skimmers for removing debris such as leafs and twigs before it sinks. These contain nutrients that nourish the algae and encourage their boom. It’s wise to build your pond away from trees, bushes, or plants.
Use gravel for the bottom of your pond, and clay for the sides. Concrete has a high pH, and can encourage the growth of algae and disturb the chemical balance of the water.
Cover two thirds of the surface of your pond with water hyacinths, water lettuces, and water lilies. These floating plants will absorb the sunlight and provide shading. Algae grow more slowly without sunlight.
Use beneficial bacteria and enzyme products regularly, according to the instructions of your pond supplier. These do not harm the fish or the other plants, and they tend to make the water clearer by reducing the sludge. Living Water Aeration offers GreenClean, a biodegradable algaecide that kills the algae in 24-48 hours after use, without harming the fish or affecting the quality of the water.
Pump out the water often as you can and then clean the pond. The sludge that forms at the bottom nourishes the algae. Pressure-cleaning your pond is recommended after you drain the water.
If you have a large pond or water garden and not much time to put into practice the above tips, consider buying one of the most effective tools for fighting algae, the Ultrasonic Algae Control System, which will eliminate algae and filmy slime in a pond of up to three acres.