Which chlorine & why?

Chlorinating, maintaining the right chlorine levels,
chlorine problems. Dichlor, trichlor, cal hypo, bleach,
granules, chlorine pucks and chlorine sticks.

Which chlorine do you use in your pool?

Trichlor - granules, tabs, pucks
294
39%
Dichlor
72
10%
Cal Hypo
94
13%
Chlorinating liquid
165
22%
Bleach - supermarket style
125
17%
 
Total votes: 750
Teapot
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Re: Which chlorine & why?

Postby Teapot » Mon 03 Jun, 2019 09:57

wcoast wrote:I'm glad you posted this topic, as I've been wondering which one to use also.

Without knowing what the pros and cons are you'll be in danger of posting stupid nonsense like some of the previous posters.
We have the information and we don't charge for it so ask and also have water test results to hand and not from dip strips.


Denniswiseman
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Re: Which chlorine & why?

Postby Denniswiseman » Wed 30 Sep, 2020 07:42

jamesjcapps wrote:Liquid chlorine is generally less costly than granular shock and comes in refillable containers, where granular shock does not. Liquid chlorine does not need to dissolve in your water as it is already in liquid form. In addition, liquid chlorine is non-scaling and leaves no residue. So I prefer Liquid chlorine

And you are not adding unnecessay CYA
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Re: Which chlorine & why?

Postby tcjack » Sat 08 May, 2021 16:55

Trichlor primary, bleach and liquid chlorine for shock.
Denniswiseman
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Re: Which chlorine & why?

Postby Denniswiseman » Sun 09 May, 2021 12:33

Look at Chlorine / CYA Chart
Excessive CYA renders your chlorine ineffective and you have to use more to get the same sanitation
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
To reduce your CYA you have to do a partial drain and refill
Continuous use of Trichlor/Dichlor will raise your CYA which means you have to raise your chlorine level as well
Marilyh
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Re: Which chlorine & why?

Postby Marilyh » Fri 22 Dec, 2023 02:05

I usally use Trichlor Tablets. Because Chlorine with stabilizer (CYA) is crucial for consistent treatment as UV radiation can rapidly degrade chlorine; however, CYA accumulates over time and doesn't naturally decrease. To reduce CYA, partially draining the pool, ideally from the bottom where CYA concentration is higher, is the most effective method.
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Re: Which chlorine & why?

Postby Jentiferr » Thu 22 Feb, 2024 02:50

I usually use Trichlor Tablets for my pool. It is convenient and cheap.
Teapot1
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Re: Which chlorine & why?

Postby Teapot1 » Thu 22 Feb, 2024 09:14

Well cheap until you have to partially drain and refil to lower CYA level. If you have treated the water further to lower Alkalinity etc then you go through more process's. Some areas have water shortages which forbids emptying and refilling.
All this can be avoided by switching to liquid bleach.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.
Denniswiseman
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Re: Which chlorine & why?

Postby Denniswiseman » Fri 23 Feb, 2024 03:39

Clorinating liquid and plain bleach are the same thing Sodium Hypochlorite
btanchors
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Re: Which chlorine & why?

Postby btanchors » Mon 13 May, 2024 15:18

All,

As a new pool owner, I am becoming more and more frustrated as I did not think simply maintaining the right chlorine levels would be so hard.

I started out using chlorine pucks in a floater. But now, my CYA levels are rising. As of yesterday, the CYA level is 78. Since I don't want CYA levels to get much higher, I looked into switching to liquid chlorine instead, as it does not increase CYA levels. But, now I am reading that liquid chlorine increases TDS (Total Dissolved solids) and Calcium hardness. From additional reading, the only real way to reduce CYA, TDS, and Calcium Hardness is to partially drain and refill the pool! I really want to avoid this. It's sounding like regardless of which method I use to maintain Chlorine, Ultimately I end up having to partially drain the pool to eliminate chemicals I cannot control otherwise.

So HOW do I maintain the proper chlorine levels without causing buildup of other things that require partially draining the pool?

FYI, my pool is located in Phoenix, AZ, and is 15,000 gallons, pebble finish. I use a cartridge filter system.

Measurements from my 5/12/2024 water test:
Free Chlorine: 2.36
Total Chlorine: 3.51
pH: 8.1
Total Alkalinity: 63
Calcium Hardness: 306
Cyanuric Acid: 78
Iron: 0.1
Copper: 0.0
Phosphates: 84
TDS: 1200
Teapot1
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Re: Which chlorine & why?

Postby Teapot1 » Tue 14 May, 2024 00:34

You were reading incorrect information (source?). Liquid chlorine does not increase calcium hardness or TDS ( you get a very slight saline increase over time but very very low) only calcium hypochlorite increase calcium levels and thats usually supplied in dry form into a feeder on your pool.
Looking after your chemical levels is easy if you follow the information on this site, its pool shops and on-line nonsense that you need to avoid. Also made a lot easier with a good test kit not dip strips which are pretty hopeless.
I may not give you the answer you want to hear, but I will give an honest opinion of your situation as you decribe it.
btanchors
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Re: Which chlorine & why?

Postby btanchors » Thu 06 Jun, 2024 10:44

OK, I have to confess to the forum and apologize for my misunderstanding of the helpful information that has been posted here.

I've been complaining that I cannot seem to keep chlorine levels in the correct range without increasing CYA levels or Calcium hardness levels.

I've discontinued use of chlorine tablets because they slowly increase my CYA levels. I understand this well and have confirmed this in actual use.

I switched to liquid chlorine once a week (typically administered on Thursday evenings) and powdered shock (Leslie's Power Powder Plus, one 8 oz package, typically administered on Sunday evenings). I noticed my Calcium Hardness levels were increasing, and beginning to approach the high end of the acceptable range. I was getting very frustrated.

In my frustration I re-read the discussion in this forum topic (Particularly the helpful postings by Teapot1). It turns out I misread and misinterpreted what Teapot1 pointed out.

I mistakenly thought both the liquid chlorine and powdered shock I was using were the same chemical. They are NOT.

The powdered shock is CALCIUM Hypochlorite. The liquid chlorine is SODIUM Hypochlorite. Use of the powdered stuff WILL increase Calcium Hardness (Because it is CALCIUM Hypochlorite). The liquid chlorine will not (Since it is SODIUM Hypochlorite).

Now that I have gotten this through my thick head, I am discontinuing use of the powdered CALCIUM Hypochlorite and switching entirely to liquid chlorine (Which is SODIUM Hypochlorite). I suspect this solves my problem - no increase in CYA levels, and no increase in Calcium hardness levels.

Apologies to all for my misunderstanding. Hopefully this helps someone else who reads the info too quickly like I did!
Denniswiseman
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Re: Which chlorine & why?

Postby Denniswiseman » Thu 06 Jun, 2024 11:23

You are correct but the pucks are usefull when on vacation
The correct amount of sodium hypochlorite can be determined by using Chlorine / CYA Chart and testing regulary with a FAS/DPD test kit (Taylor K2006c or TF Testkits TF100 in the states)

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