Why does green water appear in the pool
Opening the pool cover and finding green water is more common than it seems. This coloration indicates the presence of algae, microscopic organisms that multiply quickly when they find the perfect environment.
Summer heat, constant sunlight, and an imbalance in chemical parameters are the main culprits. When pH is out of range or filtration is insufficient, green pool water quickly appears, turning a place of relaxation into an unexpected concern.
The problems of overusing chlorine to remove green water
The immediate reaction is often to add large doses of chlorine in the hope that the water will become clear again in a few hours. However, overusing chlorine is not the ultimate solution.
An excess of this chemical can cause eye irritation, dry skin, and respiratory discomfort. It also damages pool materials, such as liners and the filtration system. Green pool water can return if the underlying causes are not corrected, even if large amounts of chlorine are added.
How to effectively prevent green water in the pool
The best strategy is not to fight algae once they have colonized the water, but to prevent them from developing. To do this, it is advisable to maintain simple routines that ensure perfect balance.
Control pH and ensure good filtration
The pool water’s pH should be kept between 7.2 and 7.6. If it gets out of balance, chlorine loses effectiveness and algae reproduce quickly. That’s why it should be measured several times a week.
Filtration is another key point. To prevent green pool water, ideally the water should circulate at least 6 to 8 hours daily. This prevents stagnation and makes algae growth more difficult.
Brushing and frequent cleaning of walls and floor
Algae easily adhere to pool walls and floor. Brushing these surfaces twice a week is a simple routine that prevents the initial layer that later turns the water green from forming.
Renew part of the water at key moments
Replacing 5% to 10% of the pool water from time to time helps eliminate accumulated residues. This practice contributes to maintaining more balanced water and makes the dreaded green color less likely to appear.
Alternatives to chlorine for treating green pool water
Although chlorine is still a great ally, it is not the only tool available. Today there are more sustainable and pleasant complementary methods for swimming.
Preventive and sustainable algaecides
Algaecide is a product designed to prevent algae growth. Preventive ones are applied in small doses on a regular basis and greatly reduce the risk of green pool water. New-generation ones are less aggressive to the environment and allow swimming just a few hours after use.
Active oxygen and other alternative systems
Active oxygen has become a fantastic alternative. It oxidizes particles without leaving residues and creates a more natural bathing sensation. It is ideal for people with sensitive skin and allows the water to stay clear without over-relying on chlorine.
Other systems such as salt electrolysis, ultraviolet rays, or copper and silver ionizers help keep algae under control and reduce how often green water appears in the pool.
Simple routines to keep the water clear and avoid the green tone
Consistency is the secret to a spotless pool. Checking pH and free chlorine levels every few days, cleaning the skimmer basket, brushing the walls, and ensuring sufficient filtration time are small habits that prevent green water from appearing.
Covering the pool at night, especially in areas with trees, prevents leaves and dust from accumulating in the water. And if temperatures are high, it is advisable to increase filtration, since heat accelerates algae proliferation.
Extra tips to prevent green water from coming back
Beyond basic maintenance, there are additional gestures that help a lot. Showering before entering prevents sunscreen and sweat from entering the water. Using a pool cleaning robot facilitates daily cleaning and removes debris from hard-to-reach corners.
If the pool has been unused for weeks, applying a preventive algaecide or a shock treatment with active oxygen before the first swim is a guarantee against starting the season with green water.
In short, having green pool water is not an inevitable problem. With regular parameter checks, cleaning routines, and the support of sustainable chlorine alternatives, the water can always remain crystal-clear, healthy, and ready to enjoy.
