The validity of the standard minimum 1. If you add pool conditioner or stabilizer, or use Trichlor tablets or Dichlor shock both stabilized chlorine types , you should make some adjustments. R un your chlorine level higher. As compensation for the suppressive effect of CYA, use more chlorine tablets until you test a consistent 2 or 3 ppm. Monitor your cyanuric acid Level. Test your level at the start and end of every season.
Remember that chlorine tablets add cyanuric acid, and the level will increase naturally. If your cyanuric acid level gets too high, dilute it by draining a portion of water and refilling or using Bio-Active CYA reducer.
Test your level with a good test kit, like my favorite Taylor K , or use Test Strips that check all levels, like LaMotte 6-way test strips. Outdoor pools without a residual of cyanuric acid in the water have trouble maintaining a chlorine residual during a sunny day. Even small levels of CYA in the water will have a pronounced protective effect.
Indoor pools can also benefit from a very low residual ppm of CYA as it helps to prevent off-gassing of chlorine and reduces chloramine formation.
If you need to raise your cyanuric acid level, you simply pour the granular white powder directly into the pool, at a rate of about 1 pound per 10, gallons to raise it about 10 ppm. Testing the water for a cyanuric acid level is the first step. The presence of CYA will turn the water sample cloudy, or turbid. Since you only need to check these levels monthly, it makes sense to have separate test strips for these tests.
Maintaining the level around ppm is recommended. There is little advantage in exceeding the level, and as shown above, the higher the level, the higher the kill time for your chlorine becomes. Other effects of high cyanuric acid levels include problems with cloudy water, and a difficulty in maintaining a free chlorine level in the pool, with a corresponding increase of chloramines.
Lower your level of cyanuric acid by dilution draining and refilling with fresh water , or by using Bio-Active cyanuric acid reducer. You can reduce the amount of cyanuric acid added from chlorine tablets by using a mineral purifier or an ozonator to reduce your chlorine demand by 50 percent.
So students, here ends another lesson in swimming pool chemistry. It can cause eye or skin irritation if direct contact is made. It is not toxic or carcinogenic. Based on data from toxicological investigations, cyanuric acid does not damage organs. Damage to the kidneys and bladder has been observed in rats tested with a saturated solution ppm of cyanuric acid for their drinking water. CYA should not pose a risk to humans during use in swimming pools.
Cyanuric acid is quickly excreted unchanged from the kidneys. Technically, CYA is an acid and is in the family of sulfuric acid, with a pH level of around 4. It will slightly reduce your pH level when added to the pool in measureable quantities but may be hard to notice.
So, no, cyanuric acid is best used for shielding your expensive chlorine from the sun, but for lowering your pH, better to use sodium bisulfate. I just purchased a home with above ground pool, approximately 5, gallons. My CYA is a little low on the test strips, what should I add to it? I am new to pool ownership, other than shock and chlorine tabs, what other chemicals should I have on hand to add as needed.
Also, my chlorine tabs in the floater are very slow to dissolve but chlorine levels are good. How long does it take for them to fully dissolve? Does cooler weather also affect dissolve rate? Thank you! Hi Kristi, CYA, aka stabilizer, protects chlorine from the sun.
The tablets are stabilized, and add a small amount anyway, with each tablet added. Tabs do dissolve more slowly in colder water. The other main level to watch closely is pH, and if you are having pH problems, look at alkalinity closely. If your pool filter is on the small side, it can be helpful to add a weekly dose of Clarifier and Algaecide to the pool, per label, probably just oz each, per week.
Hi, all readings good, chlorines, alkalinity and PH. But cyanuric acid is registering a zero. Currently have foggy water. Any suggestions? Hi, stabilizer protects chlorine from the sun, but does nothing for water clarity. Look to your filter, either it is not operating correctly, or being run long enough.
A Clarifier can help also with the cloudy water. I have basically zero on my test for CYA but im using stabilizer chlorine tablets I notice this year as its first time using these chlorine tablets that my tablets are lasting way longer then ever before one 3 inch tablet will last over a week with many sunny days my pool is in direct sun no trees at all and gets sun at min 10 hours a day.
Hi Todd, no need to add it if the tablets themselves are working. Since you are using stabilized tablets, the chlorine or hypochlorous acid as it gets wet, must already be bonded well to the cyanurates, protecting them from the sun. I had my water tested by the local pool store as well testing myself and my stabilizer is low.
How can I get my stabilizer up? Do I need to add a lot of shock since my chlorine is low and my free chlorine is 0? Hi Ashley, it usually takes a few days for the CYA additions to start to test… not sure why?
But give it days. If it still does not clear, investigate the filter, is water possibly bypassing? Is the filter media tired or worn out? Have you cleaned the filter really well lately, with a Filter Cleaner, or other method?
I just had the sand in my filter replaced this year. Should I add more than the required amount of shock for my 24 ft round pool? I have a 30, gallon pool.
Upon returning from a weekend away, we found our pool to be cloudy all was good before we left. For the last 10 days we have not been able to get much of a free chlorine reading. PH was low and we raised it to 7.
Hardness, and alkalinity are great. Cyanuric acid is at a 0. We have had two pool places tell us different things and said our numbers looked ok. The pool is clearing slowly but still no chlorine readings. Robyn, you should add 9 lbs of cyanuric acid stabilizer to have a 30 ppm level of CYA, to protect chlorine from the sun. The only way to lower cyanuric acid is by replacing water. Unlike free chlorine, cyanuric acid levels should remain level day-to-day. An exception might be if there is a heavy rain storm through which your pool is left uncovered.
The rain will introduce a substantial amount of fresh water to your pool, which may dilute the concentration of cyanuric acid. To test your cyanuric acid levels with a test strip, follow the instructions on the test strip case. Typically, you will need to submerge the strip in your pool for a minimum number of seconds. Then, you will need to wait some time for the water to react with the reagents on the strip. Finally, you will compare the color of the cyanuric acid test on the strip with the range of colors on the test strip package to get an estimate of the amount of cyanuric acid in your pool.
You may use a test kit to test your free chlorine and pH levels. The test kit may come with a cyanuric test as well. However, cyanuric acid is less critical to measure exactly than free chlorine or pH. It also does not need to be tested as often. Once per week is plenty. Therefore, test strips should suffice for most every need of pool owners and pool professionals alike. Cyanuric acid levels are raised by adding pool stabilizer. Many chlorine products come with stabilizer already mixed in.
If your CYA levels dip too low, your chlorine will be completely gone in a few hours and your swimming pool will become susceptible to bacteria and algae growth. If the pool stabilizer levels get too high, however, it overpowers the chlorine and makes it less effective. It can even lead to chlorine lock , making chlorine tests read negative even when you know there is some in there. Unless your pool is exposed to sunlight, it should be able to maintain the right chlorine levels fairly well.
Opinions vary a little among experts about the proper level of CYA a pool should have, but as a general rule, it should not dip below 30 ppm or rise above 50 ppm. Most of the time, levels above 50 ppm cause chlorine lock, which is where you have added plenty of chlorine but your tests are reading 0. You'll still need to monitor your available chlorine levels with your chlorine stabilizer at 50 ppm or lower; you can do this with consistent water testing.
A good rule of thumb is to keep your sanitizer levels at round 7. So, doing the quick math, if your pool conditioner is 50 ppm, you should shoot for free chlorine levels between 3 ppm and 4 ppm. You should use about 4 lbs of CYA per 10, gallons of water for every 30 ppm it needs to be raised. Some product instructions vary, though, so be sure to read the label for proper dosage.
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. I recommend always dissolving it in a bucket of water since it is an acid that can cause skin irritation or pool liner damage. I talked about chlorine lock earlier and this is what can happen if your CYA levels are too high. There is a chemical available called a CYA Reducer but there is still a lot of debate about whether or not it works.
The most reliable way to reduce CYA levels is dilution.
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