Depending on the type of algae found in a pond, there are several ways to combat them. For example, filamentous algae can be either fished out or reeled in. The pond and its water can be cleaned using a net or a rake (be careful not to damage the pond lining!). Sometimes, the algae can be simply reeled in by winding them around a stick.
Algae eaters in ponds
Certain animals assist you in your battle against pond algae. These include small crustaceans, water snails, pond mussels and several species of fish. However, you should not expect miracles. In addition, these little ‘helpers’ many also cause problems of their own in the pond.
Although chemical-based anti-algae agents should not be used as a long-term solution for combating algae, several premium quality and brand products are now available on the market for use on a temporary basis. These agents are also fully recommended as emergency measures. When using them, however, please remember that, even with the best products, you will not achieve lasting success if you do not properly maintain your pond and prevent new algae plagues.
Plants that compete with algae
Stocking a pond with plenty of pond-side and underwater plants is one of the best ways to combat algae. This is because floating and underwater plants use up the nutrients in the water so they are no longer available to the algae. Plants like hornwort, waterweed and water soldier have proven to be particularly good choices, as have reeds planted in the gravel around the edge of the pond.
Full decontamination to combat pond algae
Full decontamination of a garden pond should not mean that the pond is completely emptied and then cleaned with a pressure washer, for example. This would cause both huge disruption for the pond life and lasting damage to the pond’s ecosystem. If sediment or poor water parameters are causing major problems, however, extensive maintenance measures can be vital to the pond’s survival. Removing the sediment and conducting several large partial water changes helps unhealthy ponds to recover. These maintenance measures can be conducted quickly and easily. Note: keep an eye on hot weather as this can cause ponds to dry out.