![]() It doesn’t evaporate and as long as the water stays in the pool then your cyanuric acid levels will be pretty stable. The reason for this is that cyanuric acid is a very hardy pool chemical. Our suggestion to this is to basically get your cyanuric acid levels to 10ppm - 30ppm level and then switch your chlorine to liquid or unstabilised chlorine. When we asked what chlorine they were using, they said they were using chlorine pucks or trichlor tablets, and they were inadvertently raising the cyanuric acid levels of their pool making their chlorine ineffective! These pucks, or Trichlor are, believe it or not, more than 54% cyanuric acid by weight! We’ve had issues before where pool owners were telling us that the chlorination of their pool was getting worse by the day and they were using more chlorine but the more chlorine they used, the worse it became. But there are other sources as well that add cyanuric acid to your pool like chlorine pucks. ![]() Obviously, we have pure cyanuric acid or stabiliser as your main source of cyanuric acid for your pool. But if you’re not the sciencey type, then here’s the TLDR (Too long didn’t read) version: Without cyanuric acid, you’ll be losing half of your free chlorine under 20 minutes! (17 if you want to be precise). Why is it needed? If you love science, you can check out this paper here available on the QCAA and read up on the specific effects of sunlight on swimming pool chlorine in an unstabilised state. No matter what anyone says, you will need cyanuric acid for your pool, unless of course you want to stand there poolside with a shovel dumping chlorine into your pool every hour and you have unlimited funds to burn on purchasing chlorine. But if you have the pool in a location exposed to sunlight then you have to use cyanuric acid to protect your chlorine so that it can survive under the sun long enough to do its job. If you have an indoor pool or a spa that isn’t exposed to sunlight, then yes, you can get away with not using any cyanuric acid or stabiliser. The simple answer to that is, well, there is no simple answer to that. ![]() There are some chemicals on the market that state they are effective for the removal of CYA, but results are spotty at best.If you’re reading this right now, then you’re probably having problems with high levels of cyanuric acid rendering your pool chlorine ineffective, that or you’re just naturally curious if it’s possible to chlorinate your pool without using cyanuric acid for protection. This is the only option because once diluted in into solution, CYA cannot be removed from your water. Let’s say you don’t want to add chlorine shock: in that case, the best way to drop CYA levels is to drain a portion of your pool water then fill with fresh water. ![]() That’s what you’d want to add if your cyanuric acid level is high, where it’s in 70, 80, 90 parts per million range. The correct type of unstabilized chlorine in high CYA situations are liquid chlorine like sodium hypochlorite, bleach, or cal-hypo shock, then of course there is regular granular shock. Types of chlorine to avoid in this case are chlorine tablets or a di-chlor shock, both of these options are stabilized with CYA. But they’re all labeled differently so it’s hard to tell sometimes. To counteract the CYA, more and more chlorine has to be added to maintain a healthy free chlorine level. If it’s stabilized chlorine, it contains CYA as well. The problem with cyanuric acid being too high is that is can block chlorine from killing bacteria. So using Dichlor shock will naturally increase both Chlorine and Cyanuric Acid (CYA) levels. Dichlor is a compound of Chlorine and Cyanuric Acid (CYA). It prevents chlorine from being burned off by the sun. Dichlor Shock and Cyanuric Acid (CYA) Relationship The full name of the Dichlor shock most commonly used is sodium dichloro-s-triazinetrione. In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question: What kind of chlorine should be used if the cyanuric acid level is too high?īefore we get into the answer, cyanuric acid (CYA) is basically sunscreen for your pool.
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