About Aquatic Algae

Algae is usually present in bodies of water, such as lakes and ponds, as a floating green scum, thick green colour or blankets of weed. There are many different varieties but they occur for the same reasons and they all have an ability to cause harmful effects.

Harmful Effects:

Not only is green algae unsightly but it discolours the water, de-oxygenates the water and gradually makes the aquatic environment unsuitable for insects, plants and fish.


Algae is usually caused by the combined effects of heat, sunlight and excess nutrients (organic debris such as grass cuttings or phosphate run-off from fertilisers). These usually occur to cause a perfect storm in July and August.


  • Remove all debris such as leaves and grass clippings as organic debris settles on the floor of the lake and breaks down to release excess Nitrogen.
  • Take care fertilising and use zero phosphate products any time after April. Do not apply granular fertilisers too close or uphill of a water body, as phosphorous that is not used by the grass will leach through the soil.

Treatment using ProCrystal:

  • ProCrystal is supplied in a bucket of 9 sachets. They contain a Class 1 bacteria inoculated into a safe powder that is designed to absorb the excess nitrogen and phosphates that make the algae grow. The sachets can be thrown directly into the water from a boat or from the bank.

For more information on Pro Crystal click here

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