testing results

My pool is currently at CYA of 80, which is where I tend to run it year round. With my temperature and humidity conditions, and the fact that my pool is in full sun literally all day, any CYA lower than that and I cannot effectively keep it chlorinated. At a CYA of 80, my chorine consumption has drastically dropped, and I only have to add it a couple of times per week. So....each pool is different, each climate is different. It's a matter of finding what works for your pool and sticking with it. Minermom's numbers to me look good, and as long as her pool is clear, looks to me like she's doing a great job.

Janet

Hello Waterbear,

Here are the US Government’s numbers for the mean UV index for July (see here :)

http://www.cpc.ncep.noaa.gov/products/stratosphere/uv_index/gif_files/julavg.gif

Honolulu is 12, Phoenix 10 and Miami 9; my CyA at 35 sure works well with FC at 6. As stated we have minimal loss of chlorine.

Agreed that you have more extensive experience than I; and I really appreciate you taking the time out of your busy schedule to answer my posts. But the question still remains why a CyA of 35 in Hawaii with our elevated UV performs just as well as 60-100 CyA in states with lower UV?

Could it be that as Chem Geek pointed out there is minimal difference in chlorine loss after one reaches 35, do you think he is right, or possibly wrong?

Please note our mean UV index in August is 12 versus the other locations which are 9. In September our UV remains at 11, when the other locations drop to 7 or 8.

I agree that I am religiously following the water chemistry dictated by the "PoolEquations" spreadsheet but it is working for me.

pH 7.5
Alk 80
CyA 35
Calcium 425
Boron 50
Salt 3500

Please let me know what you think as I am no scientist. Maybe I am misinterpreting the datum.

Thanks again for your help.

You have not been keeping up with Richard's(Chemgeek's) lastest posts (then again I don't think you are a member at TFP), Recently he has some evidence that higher CYA levels offer more protection to chlorine than formerly thought. You have a CYA of 35 because you are using ORP control for your SWG, correct? If you were not you would seel the better chlorine retention you would get from a CYA of 70-80 ppm but becuase that would play havoc with your ORP controller it is not meant to be.

Once again, I say that your experience is with one pool. You have posted quite a bit of misinformation and was even called on it by one of the mods in this forum. I have answered many posts for your because you were not sure of the chemistry that was happening. Because you have a spreadsheet that you take as the gospel (it is merely a tool, btw) and have a basic understanding of how to run a pool (most of the time) doesn't make you an expert any more than being able to carve a roast makes you a surgeon.

Now if you are finished with this thread hijack we can get back to the OP and her questions.:)

My apologies if I misposted. I have not been online for some time so my etiquette is a little rusty. After this post I will create a new thread for any more questions I might have.

As regards CyA and SWG I had the same experience with the BBB method at 35 CyA.

I am not sure what misinformation you are referring to? I have always tempered my responses with the caveat that I am clearly nowhere near the level of expertise of the professionals on this forum.

In any case, thank you for your helpful attempts; however, in future I think it would be all-around a more enlightening experience for everyone if you could reply in a more pleasant tone. We are all just looking for advice, after all.

Thank you.

Quote:

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Originally Posted by smallpooldad

As regards CyA and SWG I had the same experience with the BBB method at 35 CyA.
Apples and oranges. You cannot compare a manually chlorinated pool with a SWG any more than you can compare a pool using ORP control to one that is not. IF you did not have the controller and raised the CYA and turned down the output you would find what I say is true.:)

I am not sure what misinformation you are referring to? I have always tempered my responses with the caveat that I am clearly nowhere near the level of expertise of the professionals on this forum.

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For the second question above I am referring to the first two posts you made in this thread.:)

I am keeping a very pleasent tone, btw!:)