Chlorine Photometer - Automatic machine, anyone used one?

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Not sure of the availability in the UK, however Becs Technology controllers are commonly used here in the states to automate commercial systems. Evoqua (used to be Siemens) also has controllers available for this purpose. Pentair Commercial also offers controllers that integrate SWG control with Intellichlor SWG’s.

None of these systems replace the need for accurate testing. You still must test and calibrate and adjust the controller to the readings from a reliable test kit.
 
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reggiehammond said:
FC/CYA Levels

Curious why you're worried about higher FC levels? That's a good thing, provided you're under SLAM levels.
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Affect on the bather?

Every bit of research I’ve done says FC of 1-3 is best with 5 being the “cut off” for the “safe” levels to swim in.

I run 0 CYA (due to the salt cell and it’s an indoor pool) so I thought I’d have to maintain lower FC levels?

I’m interested if that isn’t correct?
 
Lake Placid said:
Not sure of the availability in the UK, however Becs Technology controllers are commonly used here in the states to automate commercial systems. Evoqua (used to be Siemens) also has controllers available for this purpose. Pentair Commercial also offers controllers that integrate SWG control with Intellichlor SWG’s.

None of these systems replace the need for accurate testing. You still must test and calibrate and adjust the controller to the readings from a reliable test kit.
Click to expand...
Is this for an actual FC PPM measurement using DPD or something similar that aims on a high level of chlorine concentration accuracy? - interesting!
 
HarrisonHRG said:
I run 0 CYA (due to the salt cell and it’s an indoor pool) so I thought I’d have to maintain lower FC levels?

I’m interested if that isn’t correct?
Click to expand...
Then more than 3ppm will be harsh on the bathers.

We suggest 20 to 30 CYA for indoor pools for bather comfort. 30 CYA for example would allow you to start big swim days at 12 FC and nobody would ever know. I've thrown many parties at slam FC.
 
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HarrisonHRG said:
Is this for an actual FC PPM measurement using DPD or something similar that aims on a high level of chlorine concentration accuracy? - interesting!
Click to expand...
No, they are ORP based controllers. I've used Siemans and BECs in the field. Both very reliable.
 
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Newdude said:
Then more than 3ppm will be harsh on the bathers.

We suggest 20 to 30 CYA for indoor pools for bather comfort. 30 CYA for example would allow you to start big swim days at 12 FC and nobody would ever know. I've thrown many parties at slam FC.
Click to expand...
I think I’ll go for 20 CYA on the basis the ORP controller won’t take anything more, then like you say up the FC level to achieve a greater “buffer” for the swimmers…

Is there a correlation from FC without CYA to it with? Like a 20ppm CYA at 10PPM FC will be the same as 1.5 PPM without any CYA?

Want to keep it as sanitary as possible at the same time!
 
reggiehammond said:
The problem you'll find is that 20 CYA is below the test threshold, so you'll never really know if you where you are between 0 and 30.
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You can tell you have some CYA and it is more then 0 and less than 30. That is all you need to know.
 
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HarrisonHRG said:
Does anyone know the MAX FC level for a 20 PPM CYA pool?
Click to expand...

It is safe to swim up with FC up to 40% of CYA. For CYA 20 that would be 8ppm.


HarrisonHRG said:
Or a ratio at which FC is reduced by CYA?
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Read...

Pool Water Chemistry

This thread presents my findings so far on pool water chemistry including the following: More Accurate Calcite Saturation Index (CSI) to replace Langelier Saturation Index (LSI) Calculation of ppm HOCl (disinfecting chlorine) at various levels of Total Free Chlorine (FC) and Cyanuric Acid (CYA)...
www.troublefreepool.com www.troublefreepool.com

This thread presents my findings so far on pool water chemistry including the following:

  1. More Accurate Calcite Saturation Index (CSI) to replace Langelier Saturation Index (LSI)
  2. Calculation of ppm HOCl (disinfecting chlorine) at various levels of Total Free Chlorine (FC) and Cyanuric Acid (CYA)
  3. Determination of pH and Alkalinity changes when adding chemicals to the pool
  4. Various reaction rates including chlorine breakdown by UV
A rough rule of thumb that applies at a pH of 7.5 is that the effective chlorine level is reduced by a factor about equal to the ppm of the CYA. So, a CYA of 30 ppm reduces the disinfecting chlorine (HOCl) level to about 1/30th of what it would be with no CYA.

FC.gif


HOCl.gif
 
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ajw22 said:
It is safe to swim up with FC up to 40% of CYA. For CYA 20 that would be 8ppm.




Read...

Pool Water Chemistry

This thread presents my findings so far on pool water chemistry including the following: More Accurate Calcite Saturation Index (CSI) to replace Langelier Saturation Index (LSI) Calculation of ppm HOCl (disinfecting chlorine) at various levels of Total Free Chlorine (FC) and Cyanuric Acid (CYA)...
www.troublefreepool.com www.troublefreepool.com

This thread presents my findings so far on pool water chemistry including the following:

  1. More Accurate Calcite Saturation Index (CSI) to replace Langelier Saturation Index (LSI)
  2. Calculation of ppm HOCl (disinfecting chlorine) at various levels of Total Free Chlorine (FC) and Cyanuric Acid (CYA)
  3. Determination of pH and Alkalinity changes when adding chemicals to the pool
  4. Various reaction rates including chlorine breakdown by UV
A rough rule of thumb that applies at a pH of 7.5 is that the effective chlorine level is reduced by a factor about equal to the ppm of the CYA. So, a CYA of 30 ppm reduces the disinfecting chlorine (HOCl) level to about 1/30th of what it would be with no CYA.

FC.gif


HOCl.gif
Click to expand...
Legend,

That info is super he;pful & apologies for making you repeat what has already been said on other forums, only after did i discover the Chemgeek pool chemisty one....

Those graphs are super interesting and its interesting to see the "disinfecting" chlorine and the correlation with CYA.

Out of interest, is it HOCL that reacts with human skin etc? - Interesting that Total FC and HOCL are not directly proportional too.

I think 8ppm of FC and a 20 CYA is a great tip,

that 40% of the CYA for max FC is super handy so thanks! - Does the same apply to sanitizing power? so 8FC with 20 CYA is the same as that graph with 1.5 PPM FC 0 CYA?
 
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