When I get the FC reading and add reagent 3 for the CC reading I can not tell any change in the color. I know something is growing in the pool. Why cant I see any change in the CC's? Am I misunderstanding something?
When testing CC's
- Thread starter brian10
- Start date
It might be dissipating in sunlight. Are you SLAMming the pool? In which case, worry more about the overnight loss; that will tell you if something's still growing.
Richard320 said:
I'm not SLAMming. Just weekly testing. I related the reagent 3 test as a white blood cell count. If the white blood cell count is high, then perhaps there is an infection. If the CC's exist, perhaps there is something growing. IDK.
How do you know that something is growing in your pool? Do you see algae? Are you losing too much FC overnight?brian10 said:
Has your FC ever dropped below 7.5 % of your CYA?
JamesW said:
Yes, I see black algae. I have not bothered to check the FC loss overnight because I am aware something is there. Yes, my FC has dropped below 7.5% of my CYA of 40ppm on numerous occasions when I come home to a pool full of people on days that require a chlorine douse.
Black algae can be one of the more difficult algaes (actually, it's a type of bacteria) to deal with. You need to go through the SLAM (shock) process. For black algae, it's important to brush at least once per day.
Once you have cleared the pool of all algae, it's important to maintain a minimum of 7.5 % to 15 % of the CYA at all times. For a CYA of 40 ppm, that's 3 to 6 ppm. That means never below 3 ppm. I would target 6 ppm just to have that margin of safety.
Once you have cleared the pool of all algae, it's important to maintain a minimum of 7.5 % to 15 % of the CYA at all times. For a CYA of 40 ppm, that's 3 to 6 ppm. That means never below 3 ppm. I would target 6 ppm just to have that margin of safety.
JamesW said:
Thank you. So what's your process when testing for CC's? Why am I not getting any change in color?
Algae normally won't cause CC. CC is not a good indicator of the presence of algae. CC indicates the presence of ammonia and other such compounds.
Algae is best identified visually or by excessive FC loss over night. However, some algae have very low chlorine demand. Black algae and small amounts of mustard algae will not consume much FC. The best thing to do is to prevent algae by always maintaining an FC higher than 7.5 % of the CYA.
Right now, you need to do the SLAM (shock) process. Maintain FC at 40 to 60 % of the CYA until the water is crystal clear, there is no algae, there is no CC, and there is less than 1 ppm of FC lost overnight.
pool-school/shocking_your_pool
Algae is best identified visually or by excessive FC loss over night. However, some algae have very low chlorine demand. Black algae and small amounts of mustard algae will not consume much FC. The best thing to do is to prevent algae by always maintaining an FC higher than 7.5 % of the CYA.
Right now, you need to do the SLAM (shock) process. Maintain FC at 40 to 60 % of the CYA until the water is crystal clear, there is no algae, there is no CC, and there is less than 1 ppm of FC lost overnight.
pool-school/shocking_your_pool
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