Algae reduce water flow

block nozzles|water stress|
Horticulturists and home gardeners alike know that even the smallest amount of algae in irrigation water can fully or partially block nozzles. If algae get inside irrigation lines they reduce water flow and eventually clog emitters.  This is a major cause of water stress in plants and results in uneven growth. Therefore it is important to keep your water source clear of algae.

Coptrol can prevent algae blooms 

|remains active|
If your water source relies on environmental run-off it is possible to prevent algae blooms by applying Coptrol prior to an anticipated bloom. Coptrol remains active in the stored water until an algae bloom and then goes to work killing the bloom.

Make sure the problem is not bacterial slime 

|buried pipelines|black polythene|
When evaluating a blocked nozzle problem remember algae require light to grow, they do not grow in buried pipelines, in black polythene or any conduits that stops light from penetrating. Under these conditions bacteria thrive living on iron and sulphur producing a mass of slime which acts as an adhesive to trap solids and quickly block emitters. Coptrol will not treat bacterial slime.


If algae is a problem in your drip irrigation or in your water source follow this 5 step method to keep your water clear and bright.

1.  First identify the algae present. Please use our guide here for more information. This page explains common algae within Australia.

2.  Now calculate the volume of water to treat. Ignore depths below 1 metre. Please refer to our “Quantities” page to calculate the amount of water to treat.

3. Next calculate the amount of Coptrol needed. An easy way to calculate is:

·          Use 5 – 10 mL of Coptrol per 1000 litres of water (1 cubic metre) or 5 – 10 Litres per mega litre of water.

4. Dilute the required amount of Coptrol using a 1:10 or even a 1:20 Coptrol water dilution.

5. The best application method is by spraying. Apply on a sunlit wind free day when algae first appear. If this is impractical, please refer to our Application” page on how to apply Coptrol.