Granular and Liquid chlorine

Fishy1234

Bronze Supporter
Jul 6, 2018
301
Apple Valley, CA
Pool Size
21600
Surface
Plaster
Chlorine
Liquid Chlorine
I don't see the reason for the experiment.. the experimenting has already been done.. and the result is the FC/CYA Chart.. follow it and life will be grand. ;)
I hear you however my neighbor wants to prove you wrong. He and several others are claiming granular chlorine last longer than liquid. What do I have to lose, he gave me 2 bags for free?
I will let him know that it has conditioner in it and that is why it stays longer as I've been advised. This is a good learning experience for me.
 

Mdragger88

Bronze Supporter
Jun 1, 2018
3,347
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
@Fishy1234
Just catching up on this thread but I wanted to point out that all forms of adding chlorine aside from using a swg will add salt to the pool. So don’t let that dissuade u from liquid chlorine. If you already have the proper level of stabilizer in the water the loss from the sun should not be anymore of an issue w/ lc. Here are examples of additions to my pool.
3A6A8954-4602-482F-910C-23A663467CEB.pngEC09A716-2418-474F-97F8-85A60B87127F.pngC522AAF1-F2A5-4C12-8AF7-6B1C5EA2307A.pngB8120D58-246B-4C6F-8347-C5922A97CEBF.png
 
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Fishy1234

Bronze Supporter
Jul 6, 2018
301
Apple Valley, CA
Pool Size
21600
Surface
Plaster
Chlorine
Liquid Chlorine
@Fishy1234
Just catching up on this thread but I wanted to point out that all forms of adding chlorine aside from using a swg will add salt to the pool. So don’t let that dissuade u from liquid chlorine. If you already have the proper level of stabilizer in the water the loss from the sun should not be anymore of an issue w/ lc. Here are examples of additions to my pool.
View attachment 332324View attachment 332325View attachment 332326View attachment 332327
Thank you for the chart it really helps
 

Mdragger88

Bronze Supporter
Jun 1, 2018
3,347
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
So today's readings indicate that FC only dropped. .5 from yesterday. FC7.5, PH7.8, Alk 70, CH400. I did not check CYA today but will soon.
It’s PoolMath app - effects of adding- you can use it to see the effects of any chemical on your chemistry before you add them.
 
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magiteck

Gold Supporter
May 20, 2020
580
Neenah, Wisconsin
Pool Size
13600
Surface
Vinyl
Chlorine
Liquid Chlorine
So at a CYA of 40, your minimum acceptable FC level was 3ppm.

You added 4.2ppm, so your CYA is now ~44.2. Your minimum acceptable FC level is now 3.315ppm.

So let's say your daily FC loss is 4ppm in the Summer, which is not uncommon. You'd have to add the 1.5lbs basically every day. But, uh oh. If you add 1.5lbs every day for 5 days, you just added another 21 CYA. So now your CYA level is 65.2 and your minimum acceptable FC is 4.89.

So you follow through with your original plan, use Liquid Chlorine on the weekend to "shock" and get up to your target. Next week, back to dichlor.

At the end of Week 2, now, you're at 86.2 CYA, and your minimum acceptable FC is 6.465.

I hope you can see where this is going. Four more weeks go by, your CYA is now 170. Your minimum acceptable FC level is now 12.765ppm.

Keep in mind these are minimums. Your actual target levels should be 4+ higher than these because you need to make sure you end the day above the minimum.

In the end, you end up either:
  • With algae, because you didn't keep up on the increasing minimum FC levels.
  • Using increasingly ridiculous amounts of supplemental liquid chlorine anyway just to keep bumping up with the increasing minimums, in addition to the dichlor you're also using.
  • Having to drain and refill 50%+ of your pool water.
  • (And... given that you are concerned about your TDS levels [for whatever personal reasons] -- the ever-increasing minimums and gallons upon gallons of liquid chlorine you end up using to keep up with those minimums, mean your TDS actually probably rises even more than it would have if you had just stuck with the appropriate amount of liquid chlorine and avoided dichlor/trichlor products.)
 

Fishy1234

Bronze Supporter
Jul 6, 2018
301
Apple Valley, CA
Pool Size
21600
Surface
Plaster
Chlorine
Liquid Chlorine
I'm not arguing for granular however.my chlorine level barely dropped from yesterday when I added it. So if for some reason it does drop slowly or slower than I would be adding the granular less often. Let me take another reading tomorrow and see for sure.
 

Oly

Gold Supporter
Jun 28, 2017
2,345
Fresno, CA
Pool Size
27000
Are you testing FC before you add more? Then again an hour after you add to confirm your rise? Finally test after 24 hours and just before you add again to determine your loss. Assuming the same number of swimmers, same sun light (cloud cover), organic debris etc.
 

Fishy1234

Bronze Supporter
Jul 6, 2018
301
Apple Valley, CA
Pool Size
21600
Surface
Plaster
Chlorine
Liquid Chlorine
Are you testing FC before you add more? Then again an hour after you add to confirm your rise? Finally test after 24 hours and just before you add again to determine your loss. Assuming the same number of swimmers, same sun light (cloud cover), organic debris etc.
I usually check at noon while pump is running. I add chlorine in the evening close to sundown. Nobody uses the pool, and the spa hardly ever gets use.
 

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Bperry

Gold Supporter
Aug 20, 2020
1,071
Knoxville, TN
Pool Size
27000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-60
You should average your tests over a week or two and then calculate a daily average. Daily FC fluctuations and test error can throw off calculations and the buildup of CYA isn’t going to be measurable in one day.
 

Fishy1234

Bronze Supporter
Jul 6, 2018
301
Apple Valley, CA
Pool Size
21600
Surface
Plaster
Chlorine
Liquid Chlorine
I measured Today and FC5.5 so in the course of 3 days 8.0, 7.5, 5.5. Im not adding or using anymore of this granular chlorine because as advised it will raise my conditioner level. So I just added 3/4 gallon of liquid chlorine. I have to admit though it was nice not having to add chlorine for 3 days.
 

mguzzy

Gold Supporter
When we had the pool built 4 years ago the pool builder told us that he won't do salt water pools anymore.
A lot of them say that, especially if they also sell pool services after the build. An SWG doesn't make them any money since most owners can do their own pool servicing when they have a gizmo that automatically chorinates for them. just sayin'
 
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Fishy1234

Bronze Supporter
Jul 6, 2018
301
Apple Valley, CA
Pool Size
21600
Surface
Plaster
Chlorine
Liquid Chlorine
A lot of them say that, especially if they also sell pool services after the build. An SWG doesn't make them any money since most owners can do their own pool servicing when they have a gizmo that automatically chorinates for them. just sayin'
My pool builder didn't offer any services. Once the pool was done he handed me the remote said everything is set to run
9-5 . Later.
 

mguzzy

Gold Supporter
When we had the pool built 4 years ago the pool builder told us that he won't do salt water pools anymore.
Welp.. then it will forever be a mystery why... I love mine... It was the best home improvement investment I've ever made and I put mine in back in 2005. I will tout their use every chance I get. From easier maintenance to better water quality. Consider it. We can help you pick one and DIY the install if you are so inclined.
 
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Oly

Gold Supporter
Jun 28, 2017
2,345
Fresno, CA
Pool Size
27000
:goodpost:

Me too and I just installed my SWG over a month ago. I find myself going out to make sure it's working, testing nearly every evening and finding the FC level exactly where it should be, amazing.
What is this voodoo? :scratch: I'm used to doing more work than this. :epds:
 

mguzzy

Gold Supporter
What is this voodoo? :scratch: I'm used to doing more work than this. :epds:
Bwahhhahahaha!
Go Blazing Saddles GIF
 
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