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If the pool already has even a small amount (say, 20 ppm) of Cyanuric Acid (CYA) in it, then if you are fighting algae you should not add more CYA (until you have gotten rid of the algae) since it reduces chlorine effectiveness. If you have no CYA in the pool at all, then it is better for you to just add unstabilized chlorine to fight the algae, but it will be consumed quickly and you will need to replenish it. If you can only add the chlorine in the morning, then add some CYA to have at least some to prevent rapid loss of chlorine from the UV in sunlight. The easiest way to add chlorine and CYA at the same time is to use Dichlor, but don't overdo it.

See http://www.troublefreepool.com and the Pool School link at that site for more details on defeating algae and how to shock your pool.

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Q: Can cyanuric acid be administered to a pool with active algae?
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Related questions

What is a stablizer to raise cyanuric acid?

Cyanuric acid is a stabiliser that stabilises chlorine and stops it from being burned of by the sun. Cyanuric acid and stabiliser are both the same product.


Is Cyanuric acid same as muriatic acid?

Cyanuric acid is not the same as muriatic acid. Cyanuric acid is odorless and white in color. It is used as a component of disinfectants, bleaches, and herbicides. Muriatic acid is clear solution of hydrogen chloride in water.


What is the chemical formula of cyanuric acid?

C3H3N3O3


What product to use to raise cyanuric acid?

stabilzer


Can baking soda raise the cyanuric acid level in a pool?

No, sodium bicarb is used to increase alkalinity. Cyanuric acid is used as a stabalizer. One is base the other acidic.


Can you use muriatic acid to raise the cyanuric acid level?

No. Two different acids.


How can a high cyanuric acid level in the pool affect your health?

cyanuric acid can react with melamine to create toxins in the body, melamine may be found in dairy products from time to time.


How do you dissolve cyanuric acid?

Dissolve cyanuric acid in a bucket full of water before adding to the pool. The hotter the water the better as the crystals take a very long time to dissolve completly in cold water.


Why cant you maintain free chlorine in your pool?

Have you tested cyanuric acid ( stabilizer ) ?


Does metal conrol add cyanuric acid to swimming pool?

Most likely not.


Should chlorine tablets be used in place of stabilizer chlorine tablets so the cyanuric acid don't get to high?

Should chlorine tablets be used in place of stabilizer chlorine tablets so the cyanuric acid don't get to high?


What to do when your pool does not retain chlorine?

Ad cyanuric acid/stabilizer, this is available from your pool shop