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

Coptrol is a chelated copper compound with a low level of toxicity.
Its ability to kill algae is dependent 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 dependent on dose rate and level of algal
concentration at the time of 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 of factors including water volume,
flow rates, algal concentration and dosage methods.
 
There are three options available:
 
  • Single dose point
  • Multiple dose point
  • Drip/spray application
RCI does not recommend the use of coptrol for this specific application
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
infulence the efficiency of this dosage recommendation. For example
undertaking multi point dosing after the accumulation of high levels of
algae have accurred will significantly reduce the effectiveness of this
type of application and may require higher application rates over a
longer period.
 
Drip/Spray
 
This method is dependent on the ability of the operator to be able to pass
sufficient coptrol over the surface of the 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 over 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. This will require a minimum of
48-36 hours contact time. In extreme conditions rates can be increased
to 10ml per 1000L (cubic metre) of water. 
 
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 rate

Click here for coptrol bibliography

Click here for frequently asked questions

Click here for information on coptrol and environmental safety

If you wish to purchase coptrol click here

 
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