Joy, thanks for the detailed response and that link. Just a few follow ups.. This statement......
is simply not true unless you run your pump 24 hrs a day with the cell set to 100%. See my example above. (Run time 8 hours at 70% = 5.6 hours a day.) Now I don't know if that means the first 5.6 hours of the pump run, the last 5.6 hrs, or somewhere in between. But either way, it is only dosing for 23-1/3% of the entire day and that's during sun-shinning hours.
Also I see what you are saying here:
But these automated systems are not sensing FC and adjusting according. It is the job of the user to set it at 50%, 75%, 100% whatever. So the only thing that allows the cell to work less is me hitting the down arrow on the %'age setting or the pump run time. My statement (albeit maybe simple thinking) holds:
A cell operating 8 hours a day at 90% is working harder than a cell operating 8 hours at 50%.
All this said. In my early years of getting this pool (before I found this forum) I targeted a CYA of 30-50 as recommended by the so called "industry experts" Never once had an algae bloom.
Post discovery of this web site (2012ish) I started shooting for higher CYA levels (60-70) because I was a believer in the real experts here. I was violating the golden rule: "Don't fix what isn't broken". Still have never seen an algae bloom. Basically everything runs quite seamless either way.
This is the first year I jacked it up to that 80 level. (I'm still fixing what isn't broken). We'll see how it goes.
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Tremendous question. For all intents and purposes, this behaves exactly as a SWG.
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Nor do I. It works. My small sample size (my pool) has proven that over last few years. But us "why" guys like to see it backed up with something more concrete than: "Do it because we at TFP say so and we are always right"
Therefore an SWG pool gets a consistently applied dose of chlorine all day long.
is simply not true unless you run your pump 24 hrs a day with the cell set to 100%. See my example above. (Run time 8 hours at 70% = 5.6 hours a day.) Now I don't know if that means the first 5.6 hours of the pump run, the last 5.6 hrs, or somewhere in between. But either way, it is only dosing for 23-1/3% of the entire day and that's during sun-shinning hours.
Also I see what you are saying here:
Your thinking is wrong here. Running at a higher CYA allows your cell to work less, not more.
But these automated systems are not sensing FC and adjusting according. It is the job of the user to set it at 50%, 75%, 100% whatever. So the only thing that allows the cell to work less is me hitting the down arrow on the %'age setting or the pump run time. My statement (albeit maybe simple thinking) holds:
A cell operating 8 hours a day at 90% is working harder than a cell operating 8 hours at 50%.
All this said. In my early years of getting this pool (before I found this forum) I targeted a CYA of 30-50 as recommended by the so called "industry experts" Never once had an algae bloom.
Post discovery of this web site (2012ish) I started shooting for higher CYA levels (60-70) because I was a believer in the real experts here. I was violating the golden rule: "Don't fix what isn't broken". Still have never seen an algae bloom. Basically everything runs quite seamless either way.
This is the first year I jacked it up to that 80 level. (I'm still fixing what isn't broken). We'll see how it goes.
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With automated dosing as the reason for the lower FC/CYA ratio in SWG pools, do pools with automated liquid chlorine dosing (e.g. Stenner pump, ORP based, or liquidator) exhibit the same tolerance for a lower FC/CYA ratio?
Tremendous question. For all intents and purposes, this behaves exactly as a SWG.
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I don't see us changing our recommended level of 70 to 80 CYA when a SWG is in use or the levels of FC for it.
Nor do I. It works. My small sample size (my pool) has proven that over last few years. But us "why" guys like to see it backed up with something more concrete than: "Do it because we at TFP say so and we are always right"