If a pool is covered and both TC and FC are zero, what would prevent chlorine from being increased after chlorine is added?
There are many posts here that suggest increasing CYA in "chlorine lock."
My understanding, however, is that CYA will prevent chlorine degradation from taking place.
2Cl- + 2H2O + sunlight → Cl2 + 2OH- + H2
Testing
I have different testing units including
1. Taylor K-2006C
2. EasyTest Test Strips
3. HACH Acquacheck Test Strips
My practical case
After adding about 2 Gallons of Sodium Hypochlorite Solution to 17,500 gallons of water, I tested my pool (using strips and also Taylor) and TC + FC levels that are zero, pH is around 7.4. CYA=0, but hte pool is covered.
I then, used my salt water generator at superchlorinate after adding salt (and testing showed level of 3900), after leaving this on superchlorinate for 24 hours the salt level registered 3700, but again FC/TC are zero.
Since the pool is covered with an autocover, so I think that this should obviate CYA playing a factor. Though the tested level is close to zero. I don't believe this should be a factor in this case.
Experiment
I added about 1 drop of the sodium hypochlorite solution to 1 cup of pool water, and using a test strip the FC registered at the highest level of the test 20 (very high).
Pending
I just added another 2 gallons of chlorine, and plan to add CYA.
Meanwhile, what else could account for FC levels not rising, if the TC=FC and the pool is covered?
PS the water is clear, pump is running, filter pressure seems normal
There are many posts here that suggest increasing CYA in "chlorine lock."
My understanding, however, is that CYA will prevent chlorine degradation from taking place.
2Cl- + 2H2O + sunlight → Cl2 + 2OH- + H2
Testing
I have different testing units including
1. Taylor K-2006C
2. EasyTest Test Strips
3. HACH Acquacheck Test Strips
My practical case
After adding about 2 Gallons of Sodium Hypochlorite Solution to 17,500 gallons of water, I tested my pool (using strips and also Taylor) and TC + FC levels that are zero, pH is around 7.4. CYA=0, but hte pool is covered.
I then, used my salt water generator at superchlorinate after adding salt (and testing showed level of 3900), after leaving this on superchlorinate for 24 hours the salt level registered 3700, but again FC/TC are zero.
Since the pool is covered with an autocover, so I think that this should obviate CYA playing a factor. Though the tested level is close to zero. I don't believe this should be a factor in this case.
Experiment
I added about 1 drop of the sodium hypochlorite solution to 1 cup of pool water, and using a test strip the FC registered at the highest level of the test 20 (very high).
Pending
I just added another 2 gallons of chlorine, and plan to add CYA.
Meanwhile, what else could account for FC levels not rising, if the TC=FC and the pool is covered?
PS the water is clear, pump is running, filter pressure seems normal
Last edited: