Natural methods to prevent algae growth

Once plants grow they can provide shade for your pond, which lowers the temperature of the water and, also, the plants will consume excess nutrients. If you have plants and fish, try to aim for a 50 to 70% plant coverage on the water surface. Check your pH---too high or too low can affect algae growth. Do not be tempted to change the water since this will provide more dissolved nutrients for the algae to feed on. Also, the sudden change in temperature will be harmful to plants and fish. The addition of chemicals will clear the pool, but once the effectiveness of the chemical is gone, the problem will recur. Use them with care, if you must.