How to Control Algae in Dams and Potable water

How to Control Algae in Dams and Potable Water Supplies

Water Management a perennial problem
The management of large volumes of water in dams and potable water supplies is a perennial problem for water managers. Frequently these water impoundments are subject to run- off of fertilizers and other nutrients from agricultural land, or from storm water and other sources. These excess nutrients combined with the relatively high water temperatures experienced in Australia to produce the perfect breeding ground for algae. Algal blooms are frequently experienced. Algal blooms often degrade water in dams and potable water supplies.

Offensive smells, low dissolved oxygen and blue green algae

Some species of algae release toxins (cyanobacteria). All blooms decrease dissolved oxygen in the water which in turn effects fish within the impoundment. The visual amenity frequently declines and there is often an offensive smell associated with the blooms. Constant monitoring is essential and attacking the algae before it turns into a major bloom is essential. Coptrol is ideal for this task.

If algae is a problem in your dam, or potable water supply follow this 5 step method to keep your waters clear and bright.

First identify the algae present. If you are not certain visit www.algae.info. This site enables you to identify all the common algae in Australia.

Now calculate the volume of water to treat. Ignore depths below 1 metre. We have a page which explains the methods used to determine the amount of water to treat. If you need assistance see How to calculate the volume of water to treat with Coptrol.

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

If the algae is fine and free floating use 2 mL of Coptrol per 1000 Litres (1 cubic metre) of water. That is equivalent to 2 Litres of Coptrol per 1000 square metres of surface area
If the algae is long and stringy use 5 mL per 1000 litres of water (1 cubic metre) or 5 Litres per 1000 square metres of surface area.

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

The best application method is by spraying. Apply on a sunlit wind free day when algae first appear. If this is impractical look at our general recommendations.

If you still need help call us at no cost to you. Contact RCI where our free call numbers are displayed. Or you can email us using this form