Together We Bring Science to your farm

How to use Coptrol to Kill Algae in Waterways and Irrigation Channels

Coptrol is a chelated copper compound with a low level of toxicity. It's ability to kill algae is dependant upon the gradual accumulation of Copper into algal cells, it does not have an immediate toxic effect on algal cells. Generally it takes at least 36 to 48 hours for results to become apparent and is dependant on dose rate and level of algal concentration at application.

Algae and Algal Blooms

There is no easy definition of an alga. Algae are generally microscopic organisms, are generally thought of as simple aquatic plants which do not have roots, stems or leaves and have primitive methods of reproduction.

Click here for further information on algae.

Dosage rates depend on a number factors including water volume, flow rates, algal concentration and dosage methods.

There are three options for the application available:

single dose point

multiple dose point

drip/spray application

RCI does not recommend the use of Coptrol when using a single dose point application method.

Multi Dose Point Method

The multi point method is used when there are relatively rapid flow rates of water. Subject to being able to apply the product in a uniform and reliable manner the rate of application should be 2ml per 1000L(Cubic Metre) of water continuously for 48-36 hours. It should be noted each system has different characteristics which may influence the efficacy of this dosage recommendation. For example undertaking multi point dosing after the accumulation of high levels of algae have occurred will significantly reduce effectiveness of this type of application and may require higher application rates over a longer period.

Drip/Spray

This method is dependant on the ability of the operator to be able to pass sufficient Coptrol over the surface of water in the channel. This approach is only feasible with either a static or slow moving channel system and requires the operator to be able to apply Coptrol evenly of the surface of a channel. In our experience this system is more cost effective and reliable than the multi point dose method and can be used to prevent and treat problem algal developments. Our suggested rate of application in this situation is 5ml per 1000L(Cubic metre) of water, note this will require a minimum of 48-36 hours contact time. In extreme conditions rates can be increased to 10 ml per 1000L(Cubic metres) of water.

As a guide approximately every 2000 metres of channel holds 22 mega L of water thus requiring an application of 110 L of Coptrol. In all cases of application Coptrol should be diluted with water on at least 1:1 basis.

There are advantages and disadvantages with both methods of application, on balance we have found the drip spray method to be most efficient.

Click here for full application rates.

Click here for Coptrol Bibliography

Click here for Coptrol Frequently Asked Questions.

Click here for Information on Coptrol and Environmental Safety

If you wish to purchase Coptrol click here

Privacy Statement Terms Of Use