Algae can clog overflows or create toxic conditions in livestock water troughs or tanks. Sunlight and
warm water with nutrients, will promote algae growth. Ideally, cleaning tanks weekly will reduce
nutrients slowing algae growth.
Chemically, algae in tanks can be controlled with two methods. One method is to apply copper sulfate
crystals into the water every two to four weeks as needed. Dissolve the crystals in warm water and pour
throughout the tank to achieve the best results. A one-half teaspoon of copper sulfate crystals will treat
350 gallons of water. Keep in mind, copper sulfate will increase deterioration of metal. Also, copper
sulfate can become toxic to sheep as it builds up in their system over time.
Another method that can be utilized to reduce algae growth is to add 2 to 3 ounces of chlorine bleach
for every 50 gallons of water in the tank every week. Bleaches, without scents, are recommended.
Copper sulfate or chlorine application does not require livestock to be kept away from the tank, but best
results occur if active ingredient concentration is maintained for at least 5 minutes.