Pool Chlorine Level Does Not Register

Chlorine Doesn't Register? If you use chlorine in your pool and are noticing that your chlorine levels PPM (Parts Per Million), are not rising or even registering with your Pool Test Strips or Pool Test Kit, your not alone. This is a common problem many pool owners face at one point or another.

You would not believe how many new pool owners think that they simply need to shock and vacuum a pool to keep it maintained throughout the season (I used to be one of them). In reality there are many other factors that come into play to help maintain clean, safe and sparkly pool water.

For example, if your pools chlorine level is not registering on your test strips after multiple shock attempts, the reason is most likely that your pool needs a conditioner or stabilizer that contains Cyanuric Acid. Without this conditioner or stabilizer, water will lose chlorine very quickly to the sun. A pool with no cyanuric acid can lose all of its chlorine within just two hours. Cyanuric Acid works much like Sunblock does to protect our skin from damaging UV rays, but in the case of the pool, this stabilizer keeps the UV rays from breaking down the chlorine.

How I got our Pool Chlorine Level to Register:

  1. Tested the cyanuric acid level and added Pool Conditioner until I reached the ideal range (30-50PPM).
  2. Tested the chlorine level after the cyanuric acid had been dispensed and circulated.
  3. Amazingly, the chlorine suddenly registered on the test strip (I didn't need to add any. It was actually a bit high).
  4. Continued to test the cyanuric acid level once a month throughout the pool season.

Note: If you are using dichlor or trichlor as your primary chlorine sanitizer, you are already introducing cyanuric acid along with the chlorine and may be experiencing another problem.