How can you fix the problem of green or cloudy water in your garden pond?

Why does pond water turn green or cloudy?

Green or cloudy water in a garden pond is a common problem that can be caused by a variety of factors. One of the main culprits iseutrophication, an imbalance in the nutrient levels in the water. In this section, we will examine the issues associated with eutrophication and present an effective solution: bacterial treatments.

Eutrophication and Algal Blooms in a Pond

Eutrophication occurs when nutrients such as nitrates and phosphates accumulate in excessive amounts in the pond water. These nutrients are often introduced through organic waste, fish excrement, or uneaten food.

Excess nutrients create an environment conducive to algae growth, resulting in green or cloudy water in the pond.

Consequences of eutrophication:

• Green or cloudy water reduces visibility and detracts from the pond’s aesthetic appeal.
• Algae can smother aquatic plants by blocking their access to light and nutrients.
• An overgrowth of algae can lead to a decrease in the oxygen content of the water, harming the health of fish and other aquatic organisms.

Bacterial treatments for naturally eliminating algae

Bacterial treatments such as Biolimpid, or calcium carbonate-based treatments like Nautex or Champagne chalk, are a natural and effective way to reduce nutrient levels and control algae growth in a garden pond.

These products contain beneficial bacteria that break down organic waste, fish excrement, and other nutrients present in the water. Thanks to the action of aerobic bacteria on organic sludge, there is less nutrient release and therefore less “available food” for filamentous algae and cyanobacteria in the water column.

How do you use bacterial treatments in a garden pond?

• Choose a bacterial treatment specifically designed for garden ponds and carefully follow the instructions for use.
• Please note that if the water in your pond is warmer than 25°C, the bacteria may be less effective due to the water temperature.
• Apply the product as often as recommended, usually once a week or as needed.
• Beneficial bacteria need a certain amount of oxygen to thrive, so it is important to ensure that the water in the pond is well aerated.
• Make sure you always maintain a good level of dissolved oxygen in your pond to promote aerobic bacterial activity.

Tips for Preventing Eutrophication in a Pond

• Do not overfeed the fish, and remove any uneaten food to prevent an excess of nutrients.
• Avoid using chemical fertilizers near the pond, as they can leach into the water and increase nutrient levels.
• Clean the pond regularly by removing fallen leaves, debris, and excess algae.