The brown algae that grow a pond often form a layer that is attached firmly to pond walls. The algae need only few nutrients. They adhere with calcium to pond walls. They also need poor light and can live in deep water.
Remove brown algae
If you want to make your pond free from the algae and keep it that way, you should apply the following tips:
- Remove the brown algae and take care of sufficient, lighting between 8 to 10 hours a day.
- Remove all the decayed material from your pond and apply quickly growing oxygen plants.
- Test the water for its pH value. If it is too high (pH 9 to pH 10), add CO2 in order to reduce the value. Another method is to put a little peat in your filter. This will influence acidity of the water and consequently the pH value.
- Apply quickly growing underwater plants.
If early in the morning the pH value is relatively low (pH 7 – 8) and in the evening relatively high (pH 8 – 9) this proves that the pond environment functions, where the plants will properly grow and the water will be clear.