Why is the water green?

Dmitry Chepcheruk
Dmitry Chepcheruk
December 12, 2012
Why is the water green?

The swimming season in Russia traditionally opens with the holiday of Ivan Kupala (on the night of July 6-7). It ended on Ilyin's day (August 2), even if August was warm. Water during this period is painted green (“blooms”) and becomes unsuitable for swimming. Also water is painted in the aquarium and in any open vessel (bottle, jug, decanter).

Causes of water bloom

You can understand the reason for this phenomenon by examining a drop of water under a microscope. In the "blooming" water is easy to see the particles of microalgae. These are the so-called cyanobacteria, algae of blue-green color. For the development of cyanobacteria, two conditions are necessary: ​​sunlight and nutrient medium. The answer to the question of why the water turns green in an aquarium is obvious. An aquarium is placed in the light, because light is necessary for the normal functioning of its inhabitants. The nutrient medium is formed by the remnants of food (therefore, it is not necessary to give the fish more food than is required).In reservoirs, the nutrient medium for the development of blue-green algae is mainly created by nitrogen and phosphorus. Cyanobacteria develop in a decanter, a jug, and any other vessel of water standing in the light when in contact with air, because air has a complex formula that includes a mass of chemical elements.

Fight against water bloom

The fact that the water in the aquarium has turned green is no big deal: cyanobacteria do not pose any danger to fish, snails and other aquarium inhabitants. However, the unaesthetic appearance of the aquarium makes us acquire a special scraper for cleaning the walls. Knowing why the water turns green, it will be easy for you to avoid “blooming”. First, try to position the aquarium so that direct sunlight does not fall on it. Secondly, do not pour too much feed into the water. But if the water is still green, purchase a special chemical agent at the pet store to clean it. You can prepare a solution of streptomycin yourself - it cleans water well. Take 4 mg of powder for each liter of aquarium water. For example, if you have an aquarium with a volume of 3 liters, you will need 12 mg of streptomycin powder.Dilute it in a small amount of boiled water at room temperature and pour it into the aquarium.

Water in reservoirs is also cleaned by chemical or mechanical means. Also used for cleaning ultraviolet filters (they are equipped with pumps for this purpose) and circulating systems. In the case of the bottom-circulating method of cleaning, water is taken in by the pump from the very day of the reservoir and supplied to the surface through a piping system.

In order not to turn green the water in the bottle (jar, barrel, and other vessels), it is necessary to limit the access of sunlight and ensure tightness (minimize contact with air).