Some algae are part of life in a natural pond. The problem appears when they occupy a large part of the surface, hinder plants, or accompany a deterioration in the living conditions of the fish. To limit their development, one must understand what is feeding them and adapt the intervention to the body of water.
An earthen pond, a wildlife pond, and a filtered ornamental pond are not managed in the same way. Before choosing a product or equipment, observe the algae, the banks, the water inlets, and the bottom deposits.
Identify what is growing
Uniformly green water often corresponds to a significant presence of microscopic organisms in suspension. Strands or filaments attached to surfaces suggest filamentous algae. Small floating leaves may belong to plants like duckweed.
These situations require different methods. Take a photo of the entire body of water and some close-ups. Note if the phenomenon starts at the bottom, on the banks, in a shallow area, or near a water inlet.
An unusual colored layer, foam, or a suspicious odor warrants an opinion before any handling. Some cyanobacteria proliferations pose a risk to people and animals. When in doubt, avoid contact and prevent pets from accessing the water, in accordance with the recommendations of the Walloon Public Service.
Define a realistic goal
A living pond is not meant to have sterile walls. A limited presence of algae can coexist with an environment that is beneficial to wildlife. The question is whether their development compromises the use of the body of water or its functioning.
Photograph the same areas at regular intervals. A small, stable clump does not require the same response as rapid expansion over several banks. Also, look for associated signs: fish in distress, smothered plants, a new odor, or loss of useful depth.
The goal may be to regain a clear surface, slow down regrowth, or reduce the maintenance burden. Formulating this clearly helps avoid excessive interventions.
Seek out nutrient sources around the pond
Algae take advantage of available nutrients. In a natural body of water, some of the input comes from outside: runoff water, eroded soil, leaves, lawn clippings, or fertilization of the surrounding areas.
Observe the ground after rain. A trail of soil, an area of cloudy water at the mouth of a ditch, or vegetable waste concentrated on a bank are useful clues. They point toward taking action on the surroundings rather than repeated treatments in the water.
- Avoid throwing clippings and collected leaves into the pond.
- Maintain suitable vegetation on the banks to limit soil runoff.
- Examine drainage from walkways and neighboring land.
- Adjust garden fertilization to reduce the risk of it being washed into the water.
For a large body of water fed by a watershed, these measures may require a broader study. Penn State Extension emphasizes the importance of nutrient and sediment inputs in algae proliferation.
Evaluate the load linked to fish and feeding
If the pond contains fish that are fed, observe the feedings. Uneaten food adds an avoidable load. Even when eaten, the food subsequently contributes to waste production.
The population may have increased with growth and reproduction. The functioning of a pond that was suitable for a few small fish may become insufficient several years later.
Do not rely on adding an animal advertised as an "algae eater" to fix the entire problem. Introducing it changes the environment and does not eliminate the inputs that favor algae. First, take stock of the inhabitants already present.
Remove nuisance masses with moderation
When the identification is clear and the filaments are accessible, targeted mechanical removal can clear certain areas. Work gradually, observing the plants and small animals that may be present in the clumps.
Avoid stirring up the entire bottom or tearing out useful vegetation. Remove collected materials from the runoff circuit: leaving them on the bank, where rain will wash them back into the water, reduces the benefit of the operation.
A massive disappearance of vegetation can also increase oxygen consumption during its decomposition. This point is particularly important when the biomass is high, the water is warm, or fish are present. A large intervention should be planned with a specialist.
Silt: distinguishing organic matter from mineral deposits
Accumulated silt can contribute to the nutritional functioning of the pond, but its composition varies. Decomposing leaves should not be treated like sand or soil washed in from the banks.
Aquipond Bactovase is offered to assist in the reduction of the organic fraction of deposits. Its value is evaluated according to the pond, the formulation, and the conditions of use. It does not remove sand deposits or new soil inputs.
On an accessible pond, PondoVac vacuums may allow for localized extraction. The depth, distance from the bank, and the discharge of the vacuumed water must be compatible with the device.
A large natural pond may exceed the capabilities of a pond vacuum. In this case, the sediment thickness, access, and management of extracted materials require a specific study. Aquiflor offers guidance dedicated to the siltation of natural bodies of water.
Use plants as part of the landscaping
Plants structure habitats, occupy areas, and take up elements necessary for their growth. They contribute to the functioning of the pond, without guaranteeing the disappearance of algae on their own.
Choose species adapted to the depth and available space. A very vigorous plant can shift the problem by occupying too much surface area. The selection of aquatic plants allows you to prepare a choice to be discussed according to your pond.
Plant maintenance must also take into account the fauna. Intervene by zones and preserve refuges. When part of the excess vegetation is removed from the environment, the elements it contains are also exported.
What is the role of Aquipond Greenstab?
Aquipond Greenstab is offered to limit excessive algae proliferation in ponds. It can be considered when your body of water corresponds to the usage indicated on the instructions, with a known volume and adapted monitoring conditions.
For a large earthen pond, a body of water connected to another environment, or an poorly identified situation, have the approach validated first. The presentation of a product as natural does not exempt you from checking the conditions of use, quantity, and compatibility.
Greenstab does not replace searching for sources of input, removing nuisance masses, or managing silt. It must be part of a process whose results can be observed.
Monitor progress to avoid blind treatment
Keep a simple record: photos, occupied surface area, removal dates, rain episodes, feeding, and water measurements. Compare how quickly algae return in the same areas.
Analyses complement observation, but a low measured concentration of nutrients does not necessarily mean there was no input. Some of it may have been used by the vegetation already present.
To prepare a diagnosis, send photos of the pond, its dimensions, water inlets, and interventions already carried out to support@aquiflor.com. This information will allow us to study useful actions, from localized maintenance to more significant intervention.
Sources
- Penn State Extension — preventing proliferations and limiting nutrient inputs.
- Penn State Extension — removal of vegetation and precautions related to decomposition.
- Penn State Extension — filamentous algae.
- SPW Environment — cyanobacteria and what to do in case of doubt.
- Aquipond — Greenstab ; Aquipond — Bactovase ; Aquishop sheets linked in the text.
