What is the right Cyanuric Acid level in your spa pool or hot tub?

What is the right Cyanuric Acid level in your spa pool or hot tub?

The correct level of cyanuric acid in your spa pool should be between 30-50ppm (parts per million). To test your cyanuric acid levels, use a test strip that measures for cyanuric acid.


What is Cyanuric Acid?

Cyanuric Acid is a product that stabilises chlorine sanitiser in your pool or spa. It's a type of chemical compound known as a triazine - and if you're into chemistry that means it contains 3 atoms of carbon and 3 atoms of nitrogen. It's also known as CYA and in the pool and spa industry can be called pool stabiliser or pool conditioner.

The purpose of cyanuric acid is to protect the active chlorine sanitiser in your spa pool and stop it from degrading in the UV rays of sunlight. It does this by stabilising the chlorine - it's like a sunblock for your spa sanitiser!


Do you need cyanuric acid in a spa or hot tub?

Yes! If you are using a chlorine sanitiser, you do need to use cyanuric acid to get help your chlorine work efficiently. Without cyanuric acid, your chlorine level can drop from the ideal range to zero in less than two hours when exposed to the sun.

Two types of chlorine compounds, dichlor and trichlor, already contain some cyanuric acid. The level of cyanuric acid will build up with the continued use of either of these sanitizers.

If using any other form of chlorine, you will need to add cyanuric acid separately in order to stabilize the chlorine.


Is cyanuric acid dangerous?

No, cyanuric acid is not dangerous at the correct levels. The acceptable level of cyanuric acid is 30 to 150 ppm (except where 100 ppm maximum is regulated by your state's health department), with an ideal level of 30 to 50 ppm (mg/L).


Is it safe to swim in a pool or spa with high cyanuric acid?

If the cyanuric acid level is too high, it can cause a high level of total dissolved solids (TDS), and cause chlorine to be inefficient. This means that the chlorine won't be doing it's job of sanitising your water properly - as a result there is a high risk of bacteria or viruses being present in the water.


How do you get cyanuric acid down in a spa?

There are a few ways to reduce cyanuric acid in your spa pool or hot tub.

  1. Purchase a cyanuric acid reducer
  2. Wait for heavy rain and leave your spa uncovered
  3. Partially drain your spa and refill with new water. For diluting, you don’t have to use an exact science, but basically, if your cyanuric acid level is 5% too high, then you need to remove about 5% of the spa water and replace with fresh water.


How to raise cyanuric acid in your spa pool?

To raise the cyanuric acid level in your spa pool, you need to add a chlorine stabiliser product containing cyanuric acid. Follow the dosage instructions carefully in line with the volume of your spa or pool water. If unsure, add small amounts and test.

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