Algae Control

What is Algae

Algae are simple plants that can range from the microscopic (microalgae), to large seaweeds (macroalgae), such as giant kelp more than one hundred feet in length. Microalgae include both cyanobacteria, (similar to bacteria, and formerly called “blue-green algae”) as well as green, brown and red algae.
Algae can be grown using water resources such as brackish-, sea-, and wastewater unsuitable for cultivating agricultural crops. When using wastewater, such as municipal, animal and even some industrial runoff, they can help in its treatment and purification, while benefiting from using the nutrients present.
Most microalgae grow through photosynthesis – by converting sunlight, CO2 and a few nutrients, including nitrogen and phosphorous, into material known as biomass This is called “autotrophic” growth. Other algae can grow in the dark using sugar or starch (called “heterotrophic” growth), or even combine both growth modes (called “mixotrophic” growth).
Algae are very diverse and found almost everywhere on the planet. They play an important role in many ecosystems, including providing the foundation for the aquatic food chains supporting all fisheries in the oceans and inland, as well as producing about 70 percent of all the air we breathe but it is when you get the right conditions that you get an growth explosion in the pond/lake which looks unsightly and contributes to fish kills and water that is toxic to humans and animals.

Common types of Algae found in New Zealand.
Blue green algae bloom algae complete Blue Green algae 

Blue-green algae or Cyanobacteria are microscopic cells that grow naturally in fresh and salt waters. They are a type of bacteria, but in some ways act like plants by using sunlight to manufacture carbohydrates from carbon dioxide and water, a process know as photosynthesis. In doing so, they release oxygen. They grow in dams, rivers, creeks, reservoirs, lakes and even hot springs.  

When blue-green algae bloom, that is, grow to large numbers, they can form thick accumulations on the surface of the water. These accumulations are commonly known as scums. Blue-green algal scums form when large numbers of the algae float to the water surface using vesicles within their cells that they inflate with gas. Coming close to the surface enables them to gain maximum sunlight.

Microcystis algae complete Microcystis, (Anacystis) is probably the most common toxic algae occuring in farm dams, usually form greenish-yellow bubbly masses in still or nearly still water. The plant cells are arranged like a small hair net. A blue green algae has numerous small cells crowded within a gelatinous matrix, forming a colony which may be ovate (like an egg) or an open meshwork. Microcystis is found free floating in lakes, reservoirs and sometimes in slow flowing rivers. Colour ranges from blue-green or yellowish brown. The colonies are usually globular. A hint of red can often be seen. It is a common cause of algal blooms and can secrete chemicals that inhibit other algae. It can also produce a polypeptide which is toxic to animals after drinking contaminated water. It has also been implicated in human illnesses including necrosis of the liver (after drinking) and severe dermatitis (after contact),etc. There are 40 reported species.
Filamentous algae complete Filamentous also known as "pond moss" or "pond scum" these threadlike algae often occur in huge greenish masses floating upon the waters' surface.They can form dense mats in static water or long, rope-like strands in flowing water. Its filaments consist of series of cells being joined end to end giving a thread-like appearance. This form begins growing on the bottom or substrate and then lifts to the surface as buoyancy grows due to its production of oxygen. This form of algae may seem cottony, slimy, or coarse in texture.
Plus many more species.

Using Bacteria to Control Algae.
There is many ways to control algal blooms in your pond/lake or water feature.
The best way is " Prevention is better than Cure" by using TLC Bacteria.

S.A.T For Ponds:
Is a very powerful biological clarifier. Designed for problem ponds. It is extra powerful to clarify and beautify problem ponds.
Works at top and bottom of the pond, cleans around rocks and surfaces. Completely safe for all fish, wildlife and decorative aquatic plants. Eliminates odours and digests sludge.


Pond Medic is specially designed for ponds that have sludge, odour
or algae problems

Or you can use SensiPro Pond Dye to color your pond or water feature a lovely blue or black color,

Contact Us


03 544 4365
16 Gladstone Road
Richmond, Nelson 7020

P.O.Box 3581,
Richmond, Nelson. 7050