Cyanuric Acid Dosage Calculator
Use this pool stabilizer calculator to estimate how much cyanuric acid, also called CYA, stabilizer, or conditioner, to add to your swimming pool.
Not Sure What Your CYA Level Should Be?
Bring a water sample to Benchmark Pool Supply. Our team can help you test your cyanuric acid level, choose the right stabilizer dose, and avoid adding too much conditioner to your pool.
Do Not Add Too Much Cyanuric Acid
Cyanuric acid protects chlorine from the sun, but too much CYA becomes a problem. High stabilizer levels can slow chlorine down, make algae harder to control, and force the pool to run much higher free chlorine levels to stay effective.
See How CYA Affects Chlorine StrengthHow Much Cyanuric Acid Should You Add to a Pool?
Cyanuric acid, also called CYA, pool stabilizer, or pool conditioner, protects chlorine from sunlight. A simple way to understand cyanuric acid is that it works like sunscreen for chlorine. Without enough CYA in an outdoor pool, unstabilized chlorine can be destroyed quickly by the sun, especially during hot weather, long sunny days, and heavy pool use.
Liquid chlorine, cal hypo, and other unstabilized chlorine products do not add cyanuric acid on their own. That can be good because they do not keep increasing stabilizer, but it also means the pool needs enough CYA already in the water to protect the chlorine from UV loss. If CYA is too low, chlorine may disappear in a few hours during strong sunlight.
Why Pools Need Cyanuric Acid
Outdoor pools need cyanuric acid because sunlight breaks down chlorine. CYA helps chlorine last longer so the pool can hold a usable sanitizer level throughout the day. When stabilizer is in the right range, chlorine is protected from rapid UV loss, chemical usage can become more predictable, and the pool is easier to maintain.
The goal is not to add as much stabilizer as possible. The goal is to add enough cyanuric acid to protect chlorine without over-stabilizing the pool. Too little CYA lets chlorine burn off quickly. Too much CYA slows chlorine down and can make the pool harder to sanitize, shock, and clear.
Common CYA Target Ranges
Many outdoor pools are managed around a moderate stabilizer range, often near 30 to 50 ppm depending on the pool, chlorine type, sun exposure, and service routine. Some product directions list a maintenance range around 20 to 50 ppm. Saltwater pools and pools in extreme sun may sometimes be managed differently, but the key is to avoid letting CYA climb so high that chlorine becomes harder to keep effective.
How This CYA Dosage Calculator Works
This calculator uses your pool volume, your current cyanuric acid reading, and your target cyanuric acid level. It calculates the ppm increase needed, then estimates the amount of stabilizer or conditioner required based on the selected product dosage. Because different brands and product forms can vary, this calculator includes more than one dosing basis.
- Granular stabilizer may be dosed around 1 lb per 10,000 gallons to raise CYA by 10 ppm.
- Some dry stabilizer labels estimate 2.5 lb per 10,000 gallons to raise CYA by 30 ppm.
- Some high-purity granular estimates use about 13 oz per 10,000 gallons to raise CYA by 10 ppm.
- Liquid or instant conditioner products may use ounces per ppm and can be very different from dry stabilizer.
Do Chlorine Tablets Add Cyanuric Acid?
Yes, many chlorine tablets add cyanuric acid to the pool because most common trichlor tablets are stabilized chlorine. That means every tablet adds chlorine and also adds CYA. Tablets can be useful for certain pools and situations, but relying on them too heavily can slowly raise stabilizer levels over time.
Tablet overuse is one of the most common reasons pools become over-stabilized. A pool may look fine early in the season, but after weeks or months of constant tablet use, the CYA level can climb high enough that chlorine becomes less effective. When that happens, the pool may need much higher free chlorine levels, algae can become harder to kill, and the water may become harder to keep clear.
If you use chlorine tablets, test cyanuric acid regularly and avoid adding extra stabilizer unless your CYA level is actually low. If your CYA is already high, adding more tablets or conditioner can make the problem worse. In that case, use our chlorine-to-CYA calculator to understand how high CYA changes chlorine strength and what chlorine level may be needed.
Why You Should Add CYA Carefully
Cyanuric acid does not disappear from pool water the way chlorine does. Once CYA is added, it usually stays in the water until water is drained, diluted, splashed out, backwashed, or replaced. That is why it is better to add stabilizer carefully, circulate the pool, retest, and then adjust again if needed.
If your CYA is already high, do not add more stabilizer. High cyanuric acid usually needs dilution or water replacement, not more conditioner. Before adding CYA, test your water carefully or bring a sample to Benchmark Pool Supply so you do not accidentally create a high-stabilizer problem.
Frequently Asked Questions About Adding Cyanuric Acid
How much cyanuric acid do I add to raise CYA by 10 ppm?
To raise cyanuric acid by 10 ppm, many granular stabilizer labels estimate about 1 pound per 10,000 gallons, but some products use slightly different dosage rates. Always check the label on the exact pool stabilizer or conditioner product you are using.
Why does my pool need cyanuric acid?
Your pool needs cyanuric acid because CYA protects chlorine from being destroyed by sunlight. Cyanuric acid acts like sunscreen for chlorine, helping it last longer in outdoor pool water.
Can I add too much cyanuric acid to a pool?
Yes, you can add too much cyanuric acid to a pool. High CYA can make chlorine work slower and may force you to maintain higher chlorine levels to keep the pool clean and safe.
Do chlorine tablets add cyanuric acid?
Yes, many chlorine tablets add cyanuric acid because trichlor tablets are stabilized chlorine. Heavy tablet use can slowly raise CYA over time and may lead to high stabilizer problems.
Does liquid chlorine add cyanuric acid?
Liquid chlorine does not add cyanuric acid to the pool. That means liquid chlorine can sanitize without increasing stabilizer, but the pool still needs enough existing CYA to protect chlorine from sunlight.
Should I retest after adding pool stabilizer?
Yes, you should retest after adding pool stabilizer. Let the pool circulate fully, follow the product label for wait time, and retest before adding more cyanuric acid.
