Algae problems are a common issue in the swimming pool industry, and polyquaternary ammonium salt-based algaecides are an excellent choice.
With the rapid development of the swimming pool industry, water quality safety and maintenance have become increasingly important. Among these concerns, algae growth is one of the most common issues in pool management. The proper use of algaecides has become a critical component of pool water treatment. Currently, a variety of algaecide products—including polyquaternary ammonium salts, quaternary ammonium salts, and copper-based formulations—are widely used in the swimming pool industry.
Signs of algae growth in a swimming pool
If you notice certain signs in your pool, you’ll know that algae growth is the cause of the problem and that you need to use an algaecide to treat it.
Visual
The pool water changes color, appearing light green, dark green, or even brown or black in severe cases.
Tactile
In severe cases, you may feel a slimy deposit when touching the pool walls, steps, or underwater lights.
Olfactory
The pool emits a fishy or musty odor.
Why do algae grow in swimming pools?
- Insufficient free chlorine: High swimming pool load, organic materials, bacteria, and sunlight can all cause free chlorine to dissipate.
- Ineffective filtration and circulation systems: Algae spores remain in the pool.
- Sunlight and high temperatures: These create ideal growing conditions.
Why Control Algae in Swimming Pools?
- Excessive algae growth promotes bacterial proliferation, which can harm human health.
- It clogs the water circulation and filtration systems.
- The water turns green, which is unsightly, and the pool walls become slippery, increasing the risk of falls.
- It further depletes free chlorine in the water, causing water quality to deteriorate further and creating a vicious cycle.
Common Algae Found in Swimming Pools
Green Algae
This is the most common type. The primary color is green, though other colors may also appear depending on the variety. It is the culprit behind green water and slippery pool walls; it also indicates bacterial growth.
Blue Algae
They are actually bacteria. They are typically filamentous in shape and are mostly blue or bluish-green, though they can also be black, red, or other colors. Compared to green algae, they have greater resistance to pesticides.
Mustard Algae and Diatoms
It appears yellow-green or brown. From a distance, it resembles sand or soil scattered across the pool walls or bottom.
Black Algae
Black or dark brown, it appears in spots or filaments attached to pool surfaces and pipe joints. It has a “root-like” structure that takes hold in the cracks of the pool structure, making it the most difficult to completely remove.
Pink Algae
These are pink or red fungi (such as Purpureocillium lilacinum), which thrive along the waterline, in corners, and in crevices of the pool. They appear as spots or streaks, causing circular discoloration on the pool walls and water surface.
Common Types of Algaecides
As a chemical company with many years of experience in this industry, we offer a wide range of products of guaranteed quality. In addition, we not only have our own laboratory for testing but also a dedicated team to ensure quality control.
Copper sulfate: This is the most traditional algaecide. Green algae are most sensitive to copper, while the response of diatoms and blue algae varies by species. Copper ions can effectively inhibit green and yellow algae at concentrations below the critical level for scaling and discoloration (0.6 mg/L). However, copper sulfate is a heavy metal salt; it is toxic, and excessive use can cause precipitation and discoloration.
Chelated Copper
This is a stable compound formed by the binding of copper ions with organic ligands. Compared to copper sulfate, it offers the following advantages:
- High efficacy and long-lasting effects
- Lower toxicity
- Less prone to discoloration or precipitation
- More effective in water with higher pH or in cold water
Quaternary Ammonium Salts
These are broad-spectrum, highly effective disinfectants, primarily consisting of benzalkonium chloride and decylmethylammonium chloride. Advantages:
- They cause minimal environmental pollution and do not form precipitates.
- Easily soluble in water, odorless, low toxicity, and safe for storage and use.
- Possess surfactant properties, capable of penetrating and loosening slime.
- Wide pH tolerance range.
- Stable properties, resistant to light and heat, suitable for long-term storage.
The following are the disadvantages:
- Prone to foaming (Dimethylammonium chloride produces less foam than benzalkonium chloride).
- The product may cause significant skin irritation.
- Long-term use of quaternary ammonium salts alone can lead to resistance.
- Reduced efficiency in murky water.
Polyquaternary Ammonium Salts
These also include two types: WSCP and polyamine (PA). In addition to the advantages of quaternary ammonium compounds, they offer the following benefits:
- Better efficacy against bacteria compared to quaternary ammonium compounds.
- Generally, better algicidal efficacy than quaternary ammonium compounds.
- Less prone to foaming and exhibit stronger synergistic effects.
The following are the disadvantages:
- Reduced efficiency in murky water.
- More expensive than quaternary ammonium compounds.
Which type of algaecide should I choose?
Algaecides have undergone continuous improvement over the years. Although WSCP and PA are relatively expensive, compared to the other algaecides mentioned above, however:
- They do not cause precipitation.
- They do not cause foam.
- They are low in toxicity.
- They are highly effective at controlling algae.
They offer excellent value for money compared to the other algaecides mentioned. In recent years, our polyquaternary ammonium salt products have been exported to the United States, Japan, and Europe. Not only do we hold multiple international certifications, but we also have long-standing partnerships with our own factories. This ensures a high level of product quality.
Although algaecides are very effective—polyquaternary ammonium compounds can treat most common types of algae found in swimming pools—there are still a few stubborn algae that can be removed manually. We are confident that a combination of chemical and manual removal will restore your pool to crystal-clear clarity.
Yuncang Swimming Pool Algaecide Products
Yuncang supplies swimming pool and water treatment chemicals for international customers. Its published algaecide range includes Super Algicide, Strong Algicide, Quater Algicide, and Long-Lasting Blue Algicide. Buyers should compare each product’s current specifications and intended use before deciding which option fits their requirements.
Product names alone do not establish chemical composition or prove that products are interchangeable. Confirm the active chemistry, concentration, appearance, viscosity or solid content where applicable, recommended application, packaging, and available documentation with the supplier.
For a product inquiry, provide the intended application, required specification, estimated order quantity, packaging preference, destination country or port, and any documentation requirements. This information helps the Yuncang team review the inquiry and confirm which product and commercial options are available.
Ready to Upgrade Your Pool Water Treatment?
Contact Yuncang team today for premium algaecide solutions and competitive bulk quotations.
Frequently Asked Questions
Contact Yuncang with your target product or specification, application, quantity, packaging preference, destination, and documentation needs. The team can confirm the information and options supported by current product and commercial documentation.
Post time: Oct-26-2026