Bioremediation uses selected microorganisms to support natural biological processes within a water body.

Depending on the formulation and site conditions, beneficial microorganisms may assist with:

• organic matter breakdown;
• nutrient cycling;
• sludge management;
• biological floc formation;
• odour management;
• water clarity;
• the development of a more balanced microbial community.

Bioremediation works with the existing ecosystem. It does not replace appropriate aeration, physical maintenance, source control, monitoring or environmental management.

Aquatic Rejuvenator products may be considered for freshwater systems such as:

• lakes;
• farm dams;
• irrigation reservoirs;
• ornamental and recreational water bodies;
• golf-course and resort lakes;
• council-managed ponds and lakes;
• zoo and animal-enclosure water systems;
• stormwater retention ponds;
• large landscape water features;
• selected natural and constructed wetlands.

Applications involving potable water, protected ecosystems, sensitive species, brackish water, saltwater or regulated waterways require additional assessment before treatment.

Depending on the cause and system conditions, biological treatment may support the management of:

• accumulated organic matter;
• bottom sludge;
• unpleasant odours;
• suspended organic particles;
• high nutrient loading;
• recurring algae associated with nutrient enrichment;
• reduced water clarity;
• biological imbalance caused by continuous organic inputs.

The cause of the problem should be assessed before selecting a treatment. Microbial products cannot remove every contaminant and should not be assumed to treat heavy metals, salinity, inorganic sediment or toxic chemicals.

The appropriate formulation depends on the treatment objective and physical characteristics of the water body.

• Freshwater Liquid Solution disperses through the water column and may be suitable for broad distribution and regular biological maintenance.
• Freshwater Powder Solution combines microorganisms with a mineral carrier and is intended to deliver biological activity toward bottom areas and organic deposits.
• Freshwater Pellet Solution sinks to targeted areas and provides a convenient, slower-release option for localised sludge or bottom-zone treatment.

A combination may be recommended where both water-column and bottom-zone conditions need to be addressed. Always follow the individual product label and seek advice for large or complex sites.

An approximate volume can be calculated by multiplying the surface area by the average water depth:

Volume = Surface area × Average depth

For example, a water body with a surface area of 2,000 square metres and an average depth of 3 metres has an estimated volume of:

2,000 m² × 3 m = 6,000 m³

Because natural water bodies have uneven depths, the result is an estimate. Survey data, design drawings, water-level variation and sediment depth can improve dosing accuracy.

An initial assessment may require:

• location and use of the water body;
• surface area, average depth and estimated volume;
• water source and inflows;
• rainfall and seasonal water-level changes;
• water movement, circulation and retention time;
• aeration equipment;
• fish, plants, wildlife and other sensitive receptors;
• recent water-quality results;
• algae type or identification where available;
• sludge depth and distribution;
• photographs and site drawings;
• current maintenance practices;
• chemicals or algaecides recently used;
• the main treatment objective.

Large or environmentally sensitive sites may require laboratory testing or a site inspection before treatment.

Dosage depends on more than total water volume. BBA also considers:

• severity and duration of the problem;
• organic and nutrient loading;
• water temperature;
• dissolved oxygen;
• circulation and mixing;
• sludge depth;
• inflow and water exchange;
• treatment objective;
• product formulation;
• whether the application is an initial treatment or maintenance programme.

An initial application may differ from ongoing maintenance. Do not apply the same dosage to the liquid, powder and pellet formulations unless instructed on the relevant product label or treatment plan.

Application should provide appropriate distribution while targeting the areas of greatest concern.

Depending on the formulation, this may involve:

• distributing liquid product from multiple shoreline locations;
• dosing into a circulating inflow;
• applying from a boat;
• diluting and spraying over suitable areas;
• spreading powder across targeted zones;
• placing pellets over sludge-affected bottom areas.

Wind, currents, depth, inflows and access conditions should be considered. Avoid concentrating the entire dose in one location unless the treatment plan specifically requires targeted application.

Aeration and circulation can improve mixing and support many biological processes, particularly in warm or organically loaded water bodies.

The breakdown of organic matter consumes oxygen, so dissolved oxygen should be considered before and during treatment. Additional aeration may be advisable where:

• fish or other aquatic animals are present;
• water temperature is high;
• sludge or organic loading is substantial;
• the water is stratified;
• circulation is limited;
• dissolved oxygen is already low.

Biological products do not directly replace oxygen. Poorly aerated systems may respond more slowly and may require an integrated aeration strategy.

Response time varies according to the problem, product, season and condition of the water body.

Changes in odour or visible clarity may sometimes be noticed earlier, while sludge reduction, nutrient management and ecological stabilisation generally require a longer monitoring period.

Important factors include:

• temperature;
• dissolved oxygen;
• organic and nutrient loading;
• water exchange;
• rainfall;
• circulation;
• sludge depth;
• continued pollution inputs;
• dosage and application coverage.

Performance should be assessed against baseline observations and water-quality data rather than one photograph or individual test result.

Beneficial microorganisms do not work like chemical algaecides and are not intended to kill algae immediately.

Biological treatment may support algae management by processing organic matter and nutrients that contribute to excessive growth. However, algae may return if sunlight, nutrient inputs, stagnant conditions or other underlying causes remain.

Effective long-term management may also require:

• nutrient-source control;
• debris and sludge removal;
• aeration or circulation;
• vegetation management;
• runoff control;
• regular monitoring;
• targeted physical management.

No biological treatment can guarantee that algae will never return.

Suspected blue-green algae or cyanobacterial blooms should be professionally identified and assessed. Some blooms may produce toxins and create risks for people, animals and aquatic life.

Aquatic Rejuvenator should not be presented as an emergency toxin-removal treatment or a guaranteed method of eliminating a harmful algal bloom. Access restrictions, sampling, public-health advice and regulatory requirements should be followed where relevant.

Bioremediation may form part of a longer-term nutrient and ecosystem-management strategy after the immediate risk has been assessed.

Chlorine, copper-based algaecides, disinfectants, peroxide, ozone and other oxidising or antimicrobial chemicals may reduce microbial viability and activity.

Avoid applying live microbial products at the same time unless compatibility has been confirmed. The appropriate interval depends on:

• the active chemical;
• applied concentration;
• residual concentration;
• water chemistry;
• system volume;
• rainfall and water exchange.

Provide BBA with the product name, active ingredient and application history before introducing beneficial microorganisms.

Monitoring should reflect the treatment objective and may include:

• water temperature;
• pH;
• dissolved oxygen;
• water clarity or Secchi depth;
• turbidity;
• ammonia, nitrite and nitrate;
• total nitrogen and total phosphorus;
• chlorophyll-a;
• algae identification;
• odour;
• sludge depth;
• rainfall and water level;
• treatment dates and dosage;
• fixed-location photographs.

For large projects, baseline data should be collected before treatment so changes can be evaluated against seasonal and operational variation.

Not necessarily. Results depend on whether the sources of nutrients and organic loading are also managed.

Ongoing inputs may include:

• animal waste;
• uneaten feed;
• fertiliser runoff;
• leaf litter;
• eroded soil;
• stormwater;
• sewage or wastewater inflows;
• decaying aquatic vegetation.

Bioremediation may support recovery and maintenance, but a long-term programme may also require source control, aeration, physical removal, catchment management and periodic reapplication.

Yes. Depending on the project location, scale, and available information, BBA can assist through our authorised on-site partners with:

• preliminary site assessment;
• product selection;
• volume and dosage estimation;
• application planning;
• baseline monitoring recommendations;
• structured field trials;
• remote or on-site guidance;
• review of observations and test results;
• development of a maintenance programme.

Treatment scope, product supply, site work, sampling, laboratory analysis and responsibilities should be agreed before the project begins.