Does calcium hypochlorite raise CYA
Mia Horton
Updated on March 24, 2026
In addition to raising available chlorine, cal hypo boosts pH, alkalinity and calcium hardness (CH) levels. Trichlor has the opposite effect on pH and alkalinity — reducing it. And where cal hypo affects CH, trichlor increases cyanuric acid (CYA).
Does calcium hypochlorite contain cyanuric acid?
Cal hypo does not contain stabilizer (cyanuric acid), though it can be stabilized toward sunlight in recreational water through the use of cyanuric acid. You can buy it in slow dissolving tablet forms, or more rapidly dissolving granular forms, depending on your needs.
Does calcium hypochlorite raise pH?
Both an oxidizer and sanitizer, cal hypo is quick dissolving and is the most frequently used in the pool industry. It will slightly raise your pH, so make sure you adjust pH while using it. As the name implies, it will also raise your calcium hardness levels in your pool slightly.
Does sodium hypochlorite increase CYA?
Sodium hypochlorite is made up of a blend of liquid chlorine, water and sodium hydroxide. The popularity of liquid sodium hypochlorite is primarily due to its availability, cost and efficacy. Also, sodium hypochlorite will not contribute to an increase in calcium or cyanuric acid.Does calcium hypochlorite raise chlorine levels?
The component of cal hypo that disinfects your pool is the chlorine. Most commercially sold cal hypo products contain anywhere between 65% and 75% chlorine in the mixture. For every 1ppm of free chlorine (FC) in your pool, calcium hypochlorite adds about 0.8 ppm of calcium into the swimming pool water.
How do I raise the cyanuric acid in my pool?
Cyanuric acid is raised by adding chlorine stabilizer containing cyanuric acid. The only way to lower cyanuric acid is by replacing water.
Does pool shock raise cyanuric acid?
Cyanuric acid is also known as a Stabilizer, it helps the chlorine stay in your water. … When you “shock” continuously what you’re doing is you are actually increasing the Cyanuric acid levels steadily but the chlorine levels go up fight off what they need to then they come right back down.
Can you use calcium hypochlorite instead of sodium hypochlorite?
When considering the chemical structure of these two compounds, calcium hypochlorite contains two hypochlorite anions associated with one calcium cation whereas sodium hypochlorite contains one hypochlorite anion associated with one sodium cation. Moreover, calcium hypochlorite is more stable than sodium hypochlorite.Can you mix calcium hypochlorite with sodium hypochlorite?
Solutions of sodium hypochlorite are commonly referred to as bleach, although household bleach also contains small amounts of several other compounds, including sodium hydroxide and calcium hypochlorite. … If these are mixed with bleach, it can react with sodium hypochlorite, and form toxic chlorine gas.
Which is better for pool sodium hypochlorite or calcium hypochlorite?When buying disinfectant for your pool, you’ll probably most commonly see cal-hypo. But if you live in a region where calcium deposits are an issue, sodium hypochlorite might be the more effective way to go. Just make sure that you’re testing all your levels frequently and using it with a stabilizer like CYA.
Article first time published onDoes calcium hypochlorite increase hardness?
Water Conservation: Cal Hypo: Every pound needed for proper FAC increases the calcium hardness by 8 ppm.
Does calcium hypochlorite raise hardness?
Regardless of physical form, neither the powder or tablet versions of calcium hypochlorite contain pool stabilizer (cyanuric acid) to protect against the sun, but instead contain calcium which raises your pools calcium hardness level over time.
What do you use calcium hypochlorite for?
As we mentioned, calcium hypochlorite is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent. In addition of being used to sanitize public swimming pools it is also used to disinfect drinking water.
What are disadvantages of using calcium hypochlorite to keep a home swimming pool clean?
The main drawback in using calcium hypochlorite is the need to store the chemical properly to prevent any possible contact with heat or moisture. If calcium hypochlorite is exposed to even small amounts of either, it can cause violent explosions, fires and the release of highly toxic chlorine gas.
Is calcium hypochlorite same as chlorine?
Calcium Hypochlorite is commonly seen as granular Chlorine but also is in puck/tablet form. Calcium Hypo has an AC of 40-78% and it the most popular of the Chlorines. … The difference between the Calcium Hypochlorite sold in pool stores versus local mart stores is the AC level.
Can calcium hypochlorite go bad?
Calcium Hypochlorite, aka pool shock or granular chlorine also has a long shelf life, if kept in an air tight container, in a cool and dry (indoor) location. … Properly stored, pool shock has a shelf life of over 5 years.
What pool shock does not raise cyanuric acid?
Step 2. Cal-hypo is the most popular shock used as well as the strongest shock available. Cal-hypo is a quick dissolving, unstabilized shock which means that the sun’s uv rays will burn it off quickly and it will not increase the cyanuric acid level in the swimming pool.
Why do I need cyanuric acid in my pool?
In the pool industry, Cyanuric Acid is known as chlorine stabilizer or pool conditioner. … Adding Cyanuric Acid reduces the sun’s impact on chlorine loss. The longer chlorine is present in pool water, the longer it’s available to kill bacteria and sanitize the water.
Does Clorox shock have cyanuric acid in it?
Apparently the ingredients in Clorox Shock XtraBlue include Sodium Dichloro-S-Triazinetrione (63.05%) which suggests that using this will build up the cyanuric acid in my pool.
Does muriatic acid raise CYA?
Muriatic acid is used to lower the alkalinity and pH of your pool whereas cyanuric acid is used to stabilize the chlorine and will not noticeably lower pH.
Is muriatic acid the same as cyanuric acid?
Cyanuric acid technically is an ‘acid’ but is dissimilar to muriatic acid, which the pool industry uses to manage and adjust pool pH levels. … Unlike other ‘acids,’ it is commonly referred to as a chlorine stabilizer or conditioner, forming a chemically weak and temporary bond with chlorine.
Does bromine have cyanuric acid?
water’s edge aquatic design Cyanuric acid has its place, but not with bromine There’s one instance when all experts agree that cyanuric acid shouldn’t be used. That’s when the pool or spa is being treated with bromine instead of chlorine.
What happens when calcium hypochlorite is added to water?
Calcium hypochlorite has the molecular formula of Ca(ClO)2 and a molecular weight of 142.974 g/mol. Its CAS number is 7778-54-3. Its specific gravity is 1.21 g/cm3. When dissolved in water, it can provide nascent chlorine and oxygen to sterilize pool water or industrial wastewater.
What is the other name of calcium hypochlorite?
NamesOther names Hypochlorous acid calcium salt, bleaching powder, calcium oxychloride, chloride of limeIdentifiersCAS Number7778-54-33D model (JSmol)Interactive image
Is calcium hypochlorite carcinogenic?
The International Agency for Research on Cancer (IARC) has determined that hypochlorite salts are not classifiable as to their carcinogenicity to humans.
What's the difference between sodium and calcium hypochlorite?
Sodium hypochlorite is generally used dissolved in water at various concentrations. … Sodium hypochlorite solutions are clear, greenish to yellow liquids with an odor of chlorine. Calcium hypochlorite is a white solid that readily decomposes in water releasing oxygen and chlorine. It also has a strong chlorine odor.
Can you mix Trichlor and calcium hypochlorite?
In particular, trichloro-s-triazinetrione (trichlor) should not be mixed with calcium or sodium hypochlorite. If trichlor tablets, which are acidic, are mixed in water with calcium hypochlorite tablets, which are alkaline, they will react as they dissolve.
What is the difference between sodium dichloro s Triazinetrione and calcium hypochlorite?
Dichlor Shock is typically white in color; Cal Hypo is typically white or gray in color. Dichlor Shock contains about 10% Cyanuric Acid, which protects the chlorine in the product. Cal Hypo Shock contains calcium, which allows it to be used as a maintenance or treatment product.
What is the difference between Trichlor and calcium hypochlorite?
Calcium hypochlorite increases pH, alkalinity and calcium hardness levels. Calcium hardness is important in water in that it protects surfaces, including plaster and metal, from corroding. Trichlor, on the other hand, reduces pH and alkalinity, but increases cyanuric acid (CYA).
Can you drink calcium hypochlorite?
This bleach solution is NOT drinkable, we are using it to treat the water we do want to drink. … To make a stock of chlorine solution (do not drink this!) dissolve 1 heaping teaspoon (about one-quarter of an ounce) of high-test (78%) granular calcium hypochlorite for every two gallons (eight liters) of water.
How much calcium does calcium hypochlorite add?
When calcium hypochlorite is used, 0.8 ppm of calcium hardness is added to the water for each ppm of available chlorine added. A certain amount of calcium hardness (usually within the range of 150 ppm – 1000 ppm) is necessary to protect pool and spa surfaces and equipment from corrosion.