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When you imagine your pool, you see a crystal clear oasis of serenity, glistening in the sun, inviting you to jump in for a refreshing swim any time of the day or night. But bodies of water that have nowhere to flow tend to collect bacteria and algae, if not properly maintained. Both bacteria and algae, which grow over time, can change your pool to a very unserene colour of green. The level of effort put into getting a green pool cleaned up depends on how long the buildup has been allowed to progress. Since a small amount of prevention is worth a lot of cure, it’s good to know what causes a green pool in order to avoid the mess altogether.
Chlorine kills bacteria and algae. If there’s not enough chlorine, your pool can turn green. Solution: Test your water (or have it tested) and balance your chemicals (or have your pool pro bring water chemistry to within proper levels).
Chloramines are the chemical byproducts that build up in the water when it's improperly treated with too little chlorine. Solution: Test your water and do a chlorine shock treatment. See your local pool pro for more information (the amount of chlorine you add will depend on the size of your pool and other factors).
pH is a measure of how acidic or basic the water is. A number of different factors can contribute to a high pH level in a swimming pool. Everything from weather to oils, dirt, and cosmetics affect your pool water balance - in short, anything that comes in contact with your pool water. When the pH level of the pool is too high, it causes the chlorine to become ineffective. Solution: Test your water and balance your chemicals to adjust pH values.
CYA is a water conditioner often referred to as “sunscreen for chlorine” that prevents chlorine evaporation by the sun. Solution: Test your water and balance your chemicals.
Circulation of the pool water keeps it filtered and clean. It also helps to spread the chemicals you add to the water. Think of a cup of coffee after adding cream and sugar. It needs to be stirred. Same with the chlorine and CYA that goes into your pool. But for how long? The typical time is one hour for every 5.5 degrees of air temp as a starting point. If it’s 30 degrees outside, the pool pump needs to be running at least ten hours a day. Solution: Adjust circulation time based on weather patterns and pool usage.
You might also want to keep a calendar for routine maintenance or set reminders on your phone. If you’ve already got enough things to keep an eye on, hire a pool technician to regularly vacuum your pool, check chemical levels, and clean your filters. If you discover your pool has turned green, it’s a good idea to talk to an expert to make sure you are using the correct products to treat it. It’s not difficult to treat the problem, but you’ll want to make sure that you’re doing what needs to be done to bring your pool back to normal.