Best Way to Lower High CYA in a Swimming Pool
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- เผยแพร่เมื่อ 22 ต.ค. 2024
- One of the most common water balancing issues is having high Cyanuric Acid (CYA) in your pool. Cyanuric Acid often referred to as Conditioner or Stabilizer is added to the pool in order to slow the chlorine burn-off caused by the Sun's UV rays. But if you use 3” Chlorine Tablets (Trichlor Tablets) you will be adding Cyanuric Acid to your pool on a constant basis.
Draining the pool completely or partially is the best way to reduce the cyanuric acid level in your swimming pool. There are of course other methods. One is to use a CYA reduction product like Bio-Active, but it is an expensive product and is also hit and miss. You may also want to try the Alum method developed by Rudy Stankowitz. You can read about that method here and the steps to take.
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If your CYA level is very low the Sun's UV rays will cause the chlorine to burn off quickly leaving your pool with no sanitizer or very low levels. The Conditioner in the pool helps to protect the chlorine from burning off too quickly. So a good effective level is somewhere between 50-80 ppm.
Very high CYA levels will make the chlorine in your pool less effective which means you will have to keep the levels very high in your pool to make it effective. Your pool may also develop algae blooms even with high chlorine levels present. These algae blooms are also hard to get rid of in a pool with very high CYA levels. High levels of CYA will also give you false ORP readings if your pool uses ORP to measure the safety and swimability of the water. High CYA also will give you a false Alkalinity reading. If you test the Alkalinity and it is at 100 it is more likely at only 70 if you use the Adjusted Alkalinity reading.
Bob Lowry suggest a free chlorine level of 7.5% of your pool’s CYA level. If the CYA is at 100 ppm your free chlorine needs to be at 7.5 ppm everyday to prevent algae and for it to be effective against viruses and bacteria.
Testing the Cyanuric Acid level in your pool at the beginning of the season is crucial. There are many ways to test the CYA level in your pool including the standard Turbidity test, digital testing, and test strips.
Testing the CYA level in your pool if you suspect very high levels can be challenging. The standard Turbidity Test Kits only work effectively to 100 ppm. If you get an initial reading over 100 ppm you will have to do a dilution test of 50% tap water and 50% pool water. If the reading is still high you will need to use 75% tab water and 25% pool water and so on. Each time you dilute the sample the reading becomes more difficult to nail down accurately. Test strips are a great alternative in pools that have high CYA levels. Most test strips will go as high as 250-300 ppm so this is a good way to check pools that have very high CYA levels.
LaMotte actually makes a test strip that will read CYA levels up to 500 ppm accurately. This is a very handy test strip to have if you service pools for a living. Just dip the test strip in and then match it up to the side of the tube where there is a color chart.
Since Cyanuric Acid does not naturally leave the pool water if you add it to your pool through the use of 3” Chlorinating Tablets the levels will constantly rise. These 3” Trichlor Tablets are over 50% Conditioner per tablet by weight, so as you use them in the Summer you are constantly adding Cyanuric Acid to your pool water. The only way Cyanuric Acid leaves the pool water is through backwashing and splash out. As the water evaporates the Cyanuric Acid will remain in the pool. To lower the CYA level in your pool you will have to do a partial or full drain of the pool water.
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Wow. This was absolutely spot on with that formula! My salt pool, which is no longer running a generator, just liquid chlorine; stays around 140 ppm CYA. And I have to keep the free chlorine anywhere between 7 to 10 ppm to keep everything looking good and prevent any algae from forming. If chlorine falls within the 1 to 4 ppm (Leslie's standard), I'll start to see algae growth during the hot months. Now I know CYA is causing me to use more liquid chlorine (HASA). Appreciate the tip as always!... Can't wait to try it out.
How did the Aluminum Sulfate do for your pool?
Amazing video thanks for taking the time to make this
I have a spa that is in a hotel it is 1900 gallons. My CYA is over 200 ppm, my ph is between 7.2-7.4, my alkalinity is 200, my calcium is 240 my chlorine is 10 and cc is around 0. Although we are having issues with the feeder over feeding. I have problems with cloudy water and algea. However my water i feel is mostly clear and my boss is a little ocd. I just got my CPO certification and this is my first big time bodies of water
Would simply drain it and start over. Those readings are hard to correct in such a small body of water.
Have you ever tested a "Pool Tiger" device? I had one installed over the summer and it's the first season I had to add cya in my pool. Also the pool walls are super clean, no brushing. Water is crystal clear. Not sure why not much info is out there for Pool Tiger? Be curious on your thoughts.
Not yet. It looks interesting.
@@SPLlet me know if you need a contact over there.
Nice guy, he found a local company for me to do installation. He provided owners evaluation units for their pools.
$999.00 WOW LET ME KNOW HOW IT WORKS OUT AND HOW LONG IT WILL LAST . POOL TIGER... OR IS IT JUST ANOTHER SCAM... $999.00
Chlorine Tabs are expensive now gone way up in price now... i like using them. but watch out for fast increase in Cyanuric Acid (CYA) in your pool.
Make a tab without CYA.
they do - cal hypo tabs. But those raise the calcium level and are expensive.
That alum procedure quite the chore
Draining might be easier.
@@Josh-ew1le And it doesn’t always work. Drain down half way and refill. Then go to tabs and shock that don’t have CYA or stabilizers. I have had a level of 40 ppm all summer just from the residual CYA.
I have gone to liquid chlorine. CYA levels are doing a number on my plaster. No tabs and a shock with out CYA.
Forgot to mention I saw what looks to be a "snake oil" product in Leslie's the other day. It's supposed to be a CYA remover. It's from a company called Green Story Global. It's some pouch of 'pixie-dust' that your supposed to drop in the skimmer basket and run the pool pump non-stop for several days! Please look into this product to see if it's junk or legit. The guy in the store said it was basically 50/50 results. The people that had good results ran their pumps 24hrs for about a week!!! That sounds insane.
It sounds like a similar product to the Bio-Active stuff. Natural Chemistry just discontinued their CYA reducer as well. Everything needs to be in a specific near perfect rang to actually make the product effective.
This whole problem would be solved if non-stabilized (CYA-free) tablets were readily available and economical. That would allow us to use regular tablets until our CYA reached 50ppm a then switch over to the CYA-free ones to keep it there. We are reusing orbital rockets twice a week but can’t solve this problem?
In the meantime I’ll continue adding liquid chlorine 3 times a week. Not convenient but super effective.
Cal Hypo tablets are as close as you will get. 👍
Based on my monthly usage Cal Hypo tabs are 300% the price of liquid chlorine. That’s far too expensive to justify for the convenience. Still looking
The "stabilizer" of CYA results from the using up of the TCCA that you buy to chlorinate the pool. The chemistry basically has a ring with 3 chlorines on it. As it does its work, it drops from 3 to 2 to 1 and to 0. The ring without chlorines is replaced with hydrogen (one at a time as the Cl is used up). CYA is that - TCCA without the chlorine. Short and sweet: tablets BECOME CYA and then the CYA accumulates in the pool. While some may be diluted with more CYA "stabilizer" when you buy them (check the ingredients), by definition you will get CYA from them as the active ingredient (TCCA) is used up even if they are nearly pure.