- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
Quick question. When it says the SWG wont work when its under 50, is that the air temp or the water temp?
Where to set SWG at
- Thread starter carnivalday
- Start date
- Jul 21, 2013
- 65,848
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
Thanks. I waited this morning until the air temp got up over 50, just in case. Water temp was 68.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
I turned off my SWG several days ago since my FC was at 11.5, my CYA was below 30. I added some stabilizer yesterday and got my CYA up to 50 when I tested today, and my FC is at 8.5. Im only losing .5 FC a day. Im a little confused in looking at the FC/CYA chart, as it seems there are situations that it doesnt apply. Ive been told that I can probably keep my CYA at around 30 this time of year, which isnt on the chart, and the chart seems to indicate a minimum of 70 is required. Since I have a cage, Ive been advised that I may not even need to get my CYA above 50, even during the summer. Since Im only losing .5 FC a day, Im thinking I can leave the SWG off until I get down to around 5 FC. I know Im all over the place with this post, but thats where my brain is on this. Im having the hardest time figuring out where I need to be with CYA and FC, depending on the situation (winter/summer; cage/no cage).
- Apr 10, 2018
- 6,469
- Pool Size
- 18375
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
You can use the web version of Pool Math. Enter your numbers, including CYA and look at the "Suggested FC Levels" row. You've already learned a great deal in a short amount of time. You'll get to know the needs of your pool as time and seasons pass.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
Rancho, thats the problem. Ive been given other numbers to work off of, and they seem to be good numbers, that are different in the Suggested FC Levels row. It seems theres way more to a goal CYA number that the chart gives you. It seems all the other numbers are pretty well static, no matter the conditions. The CYA seems to have a range from 30 - 70, relying on the chart and good advise that has been on the forums, and thats just too much lattitude.
- Jul 21, 2013
- 65,848
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
You are a spreadsheet gal rather then a chart gal. Use 7.5% of your CYA level for your FC target when your SWG is running. Use 15% of your CYA level for your FC target when using liquid chlorine. Round up your calculation.
- Apr 10, 2018
- 6,469
- Pool Size
- 18375
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Things are real easy in the winter. In spring/summer, with longer days, hotter weather, and larger bather load, your pool will burn 2-4 ppm FC daily. Your probably gonna want to increase your CYA to the minimum recommended by then. If it were my pool, I would increase CYA to 60 now and as warmer weather approaches increase SWG runtime/precentage.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
Its probably a good thing is wintertime while Im learning. I can diddle with FC and CYA numbers a bit without the numbers taking a big swing. Ive got the SWG off for now since Im only losing .5 a day and Im at over 8 FC. Ill test every day until I get down to the proper number.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
I love having calculations that I can plug numbers in to. So with my CYA level at 50 right now, I should shoot for 4 as a base number for FC? I was reading on another thread that the recommended FC levels should be viewed as totally rock bottom numbers, and keeping the numbers a bit higher is a good thing. Would it be okay to level off at 5 FC just to be on the safe side?
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
So it looks like Im losing .5 FC a day (it might even be less now that I have CYA up to 50 from 30). Its probably going to stay this way for a while; its only early January. So Im thinking once my FC gets down to 5 or 6 that I can crank up the 'ol SWG again. If I run it for 6 hours at .20 on the SWG, (if my calculations are correct) that will add .6 PPM per day and should keep me fairly level. I can run a test on it once a week and should be able to tell when the SWG isnt keeping up with loss. Does this sound workable?
- Apr 10, 2018
- 6,469
- Pool Size
- 18375
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Until you get it dialed in, I think you should test every couple days. You don't want to let your FC drop and ruin all the great work you've done.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
Yes, that is a good idea. I probably was going to do that anyway, Im having too much fun testing.
I'd suggest letting it drop to about FC 5.5 and then run your pump for 5 hours per day with a SWG setting of 20%. I think you'll find that's just about right to hold it there. You can then monitor FC daily and adjust from there as required. Water temperature and chlorine demand will continue to drop for about another month here in central Florida before it starts to rise again. My guess is that you'll need 5x-6x the chlorine output in July and August and at that point you can run your ten hour pump schedule with SWG output of about 50%.
- Jul 21, 2013
- 65,848
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
I gave you a CYA/FC ratio for what should be your mid-point FC target. Your minimum FC with your SWG should be about 5% of CYA. Using liquid chlorine the minimum should be about 10% of CYA.
It is better to run a SWG for longer at lower output. That is what the CYA/FC chart assumes. The reason you can have lower FC targets with the SWG is the assumption that the SWG is running during the day and keeps the FC at a steady level close to the FC target.
You have higher FC targets and minimums when using liquid chlorine since you will have a larger drop in FC before the pool gets the next dose.
There is nothing wrong with running your FC 1 or 2 ppm above the target FC.
With CYA 50 and the SWG the target FC is 4 with a minimum of 3. FC or 5 or 6 is fine.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
Thanks Doug and Allen. I think I have a handle on it now. Great that is in black and white so I can keep referring back to it. Im somewhat amazed at what little the SWG has to run this time of year to keep the pool sparkling.
And now Im running outside to watch the Space Ex launch.
And now Im running outside to watch the Space Ex launch.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
I sat in my little pool house and watched the Spacex Falcon 9 launch. Bright red comet across the night sky. Im living my dream here.
Im no expert. Im actually lost, 16 miles down a deserted dirt path off the expert highway, but this simple fact has kept my pool sparkling for 7 years.
- Oct 25, 2017
- 604
- Pool Size
- 9700
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Jandy Truclear / Ei
jereece
Member
I read these posts with great interest. Somewhere in the conversation, the comment was made that pool companies guidance on CYA and chlorine was outdated. If I understood the conversation correct, the general consensus is to run CYA around 70 and free chlorine around 8, vs running CYA around 30 and chlorine around 3. I have had pools for 40+ years. I now have a fiberglass pool using SWG, but in the past I have had a concrete pool and a vinyl liner pool. I have always used 30 CYA and 2-3 free chlorine and my water is always crystal clear. Plus, the manufacturer of my fiberglass pool says that running higher levels will void the warranty. However, I am curious of the basis for running higher CYA and chlorine levels? Since CYA bonds loosely with the chlorine ions to make it less susceptible to being used up by UV rays, I always thought the more important thing was the ratio. Too much CYA in the ratio and you may not have enough chlorine available to do it's work and too little CYA in the ratio and UV rays react with the chlorine using it up. So I have always keep the ratio in check. But I am curious of reason for running a similar ratio, but higher values. I appreciate the feedback.