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
290
39%
Dichlor
71
10%
Cal Hypo
92
12%
Chlorinating liquid
165
22%
Bleach - supermarket style
124
17%
 
Total votes: 742
Teapot
Pool Industry Leader
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Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

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
Pool Industry Leader
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Posts: 2077
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

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
tcjack
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Posts: 1
Joined: Sat 08 May, 2021 16:50
My Pool: 20x40 ft, vinyl liner, 1 HP Haywood pump and filter in Georgia

Re: Which chlorine & why?

Postby tcjack » Sat 08 May, 2021 16:55

Trichlor primary, bleach and liquid chlorine for shock.
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2077
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

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

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