NZ
AUS 
Safety Tips
Algae issues
2 February 2015
Summer is prime time for pool owners to enjoy some splashing about in the sun; however it is also the perfect time for algal growths to gain a firm hold on your pool.
Algae issues
Cure and prevent black spot algae
Black spot is a particularly difficult algae to get rid of that typically takes up residence on the walls and floors of your pool. It can be considered similar to the black algae that grows on bathroom shower tiles, silicone seams near the bath, or the sides of the fish tank.
Here’s what you need to know about black spot:
What causes black spot?
Algae growth is caused by an imbalance in the pH of the pool water. Poor circulation may also contribute.
The name black spot is given to this particular kind of algae because of the dark spot on top of the growth, which is usually the only visible part. This head protects the layers underneath from destruction, so be sure to remove both the black head on top and the deeper roots of the algae to prevent it coming back.
Black spot is a slower growing algae than most others. It can be very difficult to get rid of, so be sure to make prevention a part of your maintenance routine.
Preventing black spot
Black spot is chlorine resistant and can be hard to remove once it has attached itself to the walls of your pool or embedded in grout between tiles. Therefore, it’s best to work on preventing the issue rather than just tackling it when it occurs.
Keeping your pool’s free chlorine levels above 1.5 parts per million can help prevent the growth of black spot and other algae. After putting chlorine in your pool, make sure the chlorine is evenly distributed by keeping the water circulating properly. This is to ensure the chlorine reaches areas where black spot is most likely to grow, such as tight corners and the deeper end of the pool. Regular vacuuming and the removal of leaves will help prevent black spot also.
How do I treat it?
If you suspect you may have black spot forming in your pool, collect a water sample and bring it into your local Swimart store. They will recommend a suitable treatment option for you and give you information on how to effectively treat the problem.
If you don’t have time to bring in a water sample, book a Water Health Check with one of Swimart’s technicians and they will come to you.