Why is the water in your pond or pond green?

Why and how to remedy green water in your pool? This green water is mainly due to the appearance of microalgae. In fact, it is phytoplankton : unicellular algae not to be confused with filamentous algae .

Green water is very common in new ponds, especially those with nutrient-rich water.

Why is the pond water green?

Green water appears especially during spring. Nails begin to heat up around 14 degrees, phytoplankton are formed. The heat therefore amplifies the imbalance of the basin's ecosystem, but this is entirely natural.

In addition to strong sunlight and warming of the water, other causes can be added to this, a peak in nitrates, often due to:

• The overpopulation of fish in the basin, the lack of plants,
• An accumulation of organic waste often due to falling leaves in autumn and winter.
• Also the lack of oxygen in the pond and stagnant water.
• Another cause is the use of a filter that is not efficient enough in relation to the size of your pool and an insufficient regular supply of water. You must change 10% of the volume of your pool per week. Green cloudy water is absolutely not harmful to your fish. It also helps protect them from sunburn.

Proposed solutions to avoid green water in the basin

Product use

The first solution and often the first reflex is to use the product. If you look carefully on the Internet, the tips you find are often written by manufacturers, who are trying to sell their products.

That said, before any intervention, the ideal is to work on the causes that led to the appearance of green water. This is an important step because, obviously, the phenomenon will probably return until the true causes have been found and treated.

Use of pumps and filters

There are other systems which make it possible to attenuate this effect: the use of a pump and a filter, the multiplication of plants (also troublesome) and trying to create as many waves as possible in the pool.

⭐ It may interest you: we show you how to choose your pond pump .

In summer, the lakes and ponds are green because, of course, there is no filtration system. A fish population that is difficult to regulate, often lacking in oxygenated plants and insufficient water mixing. Conversely, rivers and waterfalls are not conducive to opening, as the water is non-stagnant and not in a closed circuit.

⭐ You may be interested: our detailed article explains how to choose a filter for the garden pond .

The use of UV sterilizer

Then the use of UV sterilizer is another solution which is the most effective of all. On the other hand, the default is the current consumption, indeed, and it takes about 3 to 5 Watts per cubic meter of water, depending on the dimensions of your pool.

⭐ You may also be interested in: our collection of ultraviolet devices

To date, this is really the only solution that can be described as truly effective in the fight against green water.

Warning: this requires the use of a pump, of course, adapted to the flow rate of your UV sterilizer. In parallel is the best ecological solution compared to the use of algaecides.

Finally, the electricity consumption of UV will cost you much less all year round. Unlike the use of multiple products which will only work temporarily, knowing that these products will also have an impact on the fauna and flora.

Conclusion

Green water is safe for your fish, safe for your pond, it's really just the aesthetic side of it. It also allows you to hide your fish from the sight of predators.

⭐ You may be interested: the list of oxygenating plants to keep a balanced pond

If you are more organic or natural, you will leave your pool with green water. On the other hand, if you really want to have crystal clear water, the ideal would be to go through the UV sterilizer which is one of the best alternatives.