Just make sure that you wait at least 20 minutes after adding chlorine stabilizer (and that it's completely dissolved into the water) before you go swimming. The same rule applies to all other swimming pool water chemicals including adding alkalinity increaser, chlorine, algaecide, and more.
When all the other chemicals, such as chlorine. pH and alkalinity, are balanced, add the chlorine stabilizer. Add the stabilizer only after the filter has been backwashed to ensure it is cycled through a clean filter. Add the stabilizer slowly through the skimmer as per the product's instructions.
The addition of a cyanuric acid stabilizer to pool waters treated with chlorine is necessary to protect the active life of chlorine and its derivatives in the waters from the damaging effects of the sun's ultraviolet (UV) rays.
It is recommended to wait at least 20 minutes to an hour after adding water balancing chemicals. You should wait 2-4 hours (or one full cycle through the filter) to swim from the moment you use calcium chloride in your pool.
It Should Not Be Done Together. While shocking and adding algaecide is effective in getting rid of algae, it should not be done together. This is because when you mix chlorine and algaecide together, it renders both of them useless.
You can either add the stabilizer to a pool skimmer box sock and hang the sock in front of the return jet or place it in the skimmer box. Or you can simply mix it in a bucket of water first and dump it into the skimmer box. Either method is fine to dissolve the stabilizer.
Perhaps most important note of all, never add chlorine and muriatic acid together in the pool. This creates a dangerous toxic gas that can have severe health consequences if inhaled.
You should never add chlorine and muriatic acid at the same time. The muriatic acid will react with the chlorine in your pool and create a deadly gas called hydrochloric acid. You need to wait for a minimum of 30 minutes, after you add the acid, before adding any chlorine to your pool.
Adding Stabilizer
Some suppliers suggest adding granules via the skimmer so that they dissolve in the filter, releasing stabilizer to the pool over several days. Pool owners should avoid backwashing the pool for three days after adding stabilizer, allowing time for the product to fully dissolve and circulate.
If you're adding chlorine to your water, there's a good chance you're adding cyanuric acid along with it. Many chlorine products, like trichlor or dichlor granules or tablets, are known as stabilized chlorine products.
It does this by stabilizing the chlorine molecule that would otherwise breakdown in direct sunlight. You should only add stabilizer if your levels are below 30ppm. Usually, all you have to do is check the level of stabilizer (cyanuric acid) in your pool every week to judge whether it's doing the job or not.
What level should it be at? Stabilise levels in the pool should be between 30-50ppm. As a rule of thumb it's best to test for stabiliser (CYA) once a month to maintain a correct level. Roughly add 2kg per 40,000L to raise the stabiliser level by 30ppm, but always read the guide on the packaging.
If the stabilizer level is too high in a pool, it will lock the chlorine molecules, rendering them ineffective as a sanitizer. This usually happens as a result of using chlorine tablets that contain cyanuric acid.
Pool stabilizer is also sometimes called pool conditioner, chlorine stabilizer, or cyanuric acid (CYA). Its purpose is to stabilize the chlorine in your pool water, so the sanitizer lasts longer. This will ultimately help keep your water clean for a longer period of time.
How to add stabilizer to your pool. Most manufacturers say to add your CYA to a bucket of warm water first and others say you can pour it directly into the pool.
Liquid chlorine is an unstabilized chlorine and does not have any stabilizer (cyanuric acid or CYA) in it. This means that if used in a pool that is located outside and the water has no stabilizer or conditioner already in the water, the UV rays in the sun will degrade the chlorine in about 9 hours.
After adding pH increaser or decreaser you'll want to wait about two to four hours, although some chemical manufacturers suggest a full turnover cycle, before retesting. The smaller the increments you need to adjust for pH, the less time you'll need to wait for the results to become stable.
If you need to nudge your pH upward, you can run your pump to aerate your pool and gently bring your pool pH levels up. Remember, you can always add more muriatic acid if you need to. So start slowly and add only up to ½ gallon of muriatic acid at a time.
Muriatic acid is hydrochloric acid, HCl. "Chlorine tablet" is slang -- the tablets are actually calcium hypochlorite, Ca(OCl)2. Yes, mixing the two creates chlorine gas.
Some people will tell you that it's safe to swim just 30 minutes after adding muriatic acid to your pool water. But we recommend playing it safe by waiting three to four hours and testing your water before swimming in your pool.
One gallon of muriatic acid will lower the alkalinity about 50 parts per million per 15,000 gallons of existing balanced pool water. So if you had a reading of 100 ppm and you added one gallon of muriatic acid in the same-size pool, the reading should drop to around 50 ppm.
Other chemical imbalances: High levels of accumulated phosphate and bromine and imbalanced stabilizers, such as cyanuric acid (CYA) might also cause cloudiness. If you are using cyanuric acid often, make sure that the CYA and free chlorine levels are balanced, because excess CYA will significantly reduce free chlorine.