Algae growth can be quite annoying and unsightly to have growing in the pool. It is good to know what causes the growth to then aid in the prevention of algae growth in the pool. Algae can be first introduced to the pool from debris entering the pool. Contamination from swimmers transferring it into the water from their clothing or feet or even transmitted via air bourn particles. Running the pool filter often keeping the water moving and keeping the chemicals in balance will reduce the amount algae building up in the pool.
Before knowing how to treat the algae in the pool, the algae needs to be identified. By identifying the algae this will increase the chances and removing it permanently from the swimming pool. The common algae found in swimming pools are yellow algae, green algae, and black algae.
Yellow Algae (Synura) a yellow, mustardy colour and is the most challenging pool algae to remove. It has a very slimy and slippery consistency. The yellow algae will be commonly found in the pool’s corners or deeper end of the pool as it tends to prefer less lighting and little water movement.
Green Algae (Chlorophyta) is green in colour and is the most common algae found in swimming pools. The green algae grows and spreads in pools very quickly as it grows from in the sunlight and nutrients from the water. There are 2 forms of green algae which can appear in the swimming pool. The wall growing green algae which is green and fury looking but very slippery to touch. While the other form is floating green algae. The floating green algae will dramatically change the water colour of the pool causing it to look cloudy.
Black Algae (Cyanobacteria) grows as small black spots, commonly found in the pool’s corners or deeper end of the pool as it tends to prefer less lighting and little water movement. This algae is different to other algae as it has a gritty or course texture and grows a protective exterior making it challenging to remove from the swimming pool.
Treating Algae In Swimming Pools
By following the below guide, a combination of regular maintenance, proper chemical balancing, and good pool hygiene. These steps will dramatically reduce the chance of the algae returning to the swimming pool.
Check the water
By completing a water test up first might indicate the reason the algae have started to grow and spread in the pool to start with. One of the most important steps to preventing algae growth is to maintain proper chemical levels.
– Chlorine: Levels between 1 and 3 ppm. Chlorine helps kill algae and bacteria.
– pH Balance: Level between 7.4 and 7.6. A balanced pH ensures that chlorine works effectively.
– Total Alkalinity: Keep alkalinity between 80 and 120 ppm. Proper alkalinity stabilizes pH levels.
– Calcium Hardness: Maintain calcium hardness between 200 and 400 ppm. Proper calcium levels help prevent scale formation and improve water clarity.
Clean The Pool
-Using a soft bristle pool brush to brush the walls, steps and floor thoroughly and completely stir up the pool water (the water will be extremely cloudy and look very uninviting at this point). By dislodging the algae from the pools surface will allow the chemicals to kill the algae easier.
-Perform periodic shocking (super chlorination) to kill any algae spores and keep the water clean. This is adding a high dose of chlorine to the pool. Follow the manufacturer’s instructions on the container of the bottle prior to use.
-Run the pool filter for an extended period of time, recommended time is between 24-36H depending on the size of the pool.
– Clean the pool filter or back flush to system to remove the algae and debris from the system.
– Retest the pool water and add the required chemicals to the water for a proper chemical balance.
– Add Algaecide to the pools water. Consult with a local pool shop supplier prior to purchasing as there are preferred algaecides for each algae. Be sure to buy the right one for the pool. Regularly adding a preventative algaecide to the pool is recommended especially during warmer months. Follow the manufacturer’s instructions for dosage and application
– If the pool water is still not looking crystal clear, consult with a local pool shop professional, they may advise to add a second dose of shock to the pool and repeat the above steps.
Preventing Algae Returning To Swimming Pools
Regular Cleaning – Skim the pool daily to remove leaves, debris, and organic matter that can fuel algae growth. Vacuum the pool weekly or by having an automatic pool vacuum cleaner. Brushing the pool walls and floor at least weekly to remove any early signs of algae. Pay special attention to corners and steps where algae can accumulate.
Maintaining Good Water Circulation – Running the pool filter regularly to ensure good water circulation. The filter helps remove debris and algae spores from the water. Keeping the pool pump running for at least 8 to 12 hours a day to ensure proper water turnover and circulation.
Check and Clean the Filter – Regularly cleaning and maintaining the pool filter (cartridge sand or glass). A clean filter will run more effectively while it is clean to removing algae and debris.
Control Chemical Balance – Don’t overuse chemicals, as it can upset the balance of the pool water. Stick to a regular maintenance schedule and follow dosage instructions. Low water levels can reduce the efficiency of the filtration system and disrupt the chemical balance by adding large amounts of water at once. It also assists proper circulation of the pool.
Regular water testing- Testing the pool water frequently using a at home test kit or strips or at a pool shop, pending on which season it currently it. Regular testing will help identify any imbalances before they lead to algae growth
If there are noticeable signs of algae such as cloudy water, green or yellow slimy patches or black shadows in the corners of the pool, address the problem immediately. Brush and shock the pool, and adjust the chemical levels as needed.By following these practices, it will significantly reduce the risk of algae growth in the pool and keep the pool clean, clear, and inviting. Regular maintenance and attention to water chemistry is key to preventing algae and ensuring a healthy swimming