Liquid chlorine

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Redsurprise

Well-known member
Jun 12, 2023
194
Surprise, AZ
Pool Size
6000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
I thought I had more chlorine on hand but was down to my last jug and need more. Walmart is out and Leslie’s is closed and I work at hospital all day tomorrow . Can’t wait until Friday. HDX Chlorinating Liquid from Home Depot (also called shock) I can use, right? Which percent is it in pool math? 10%?IMG_9811.jpeg
 
Although the date code says it is about 9 months old.

It may be more like 8%. Test 30 minutes after adding and see what your actual FC is.

1736998971181.png
 
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Just added it to pool.
Will Recheck in 30 min and see. Where is the best place to get liquid chlorine ? Last year I got some at Leslie’s but then didn’t need to use any for a long time due to salt cell. But too cold now for salt cell.
 
Not sure what to make of results. I tested it about 45 min to 1 hour after adding (pool
Pump on medium) , and got same result as my check just before adding. FC of 7. And I had pool math with a target of 11 for FC and added 3 cups, 6oz (but I think I actually only added 2 cups 6 oz maybe), but still it should have at least gone up to 9 or 10 on the FC. Even if severely degraded by half, shouldn’t it have gone up a little?
 
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Redsurprise said:
Not sure what to make of results. I tested it about 45 min to 1 hour after adding (pool
Pump on medium) , and got same result as my check just before adding. FC of 7. And I had pool math with a target of 11 for FC and added 3 cups, 6oz (but I think I actually only added 2 cups 6 oz maybe), but still it should have at least gone up to 9 or 10 on the FC. Even if severely degraded by half, shouldn’t it have gone up a little?
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Yes, you should have tested 9 or 10, even if degraded by 50%.

Chlorine, degrades. Heat is the killer. HD has severely storage degraded by storage outside. AZ is a hot place during the summer. The only protective we can proactive is the knowledge is how to decode/read the mfg the date of the chlorine when you buy it...
 
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1poolman1 said:
The advantage of a VSP is that you can adjust the flow to meet the requirements of your system. You have not indicated which filter you have at present.
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ajw22 said:
Although the date code says it is about 9 months old.

It may be more like 8%. Test 30 minutes after adding and see what your actual FC is.

View attachment 624729
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Can you Guys please educate me how you decode the date so i can be aware for the future when i have to buy? Also, does every Brand of Clorinating uses the same decoding formula?

Thanks in advance.
 
Redsurprise said:
I wonder if Home Depot would let me return it since the chlorine is so degraded it didn’t move my chlorine at all.
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You can test its strength and get a fairly accurate estimate. I can’t recall exact numbers but the one I tested that was 12% was 3% after 6-9 months.

Liquid Chlorine - Further Reading

www.troublefreepool.com www.troublefreepool.com
 
wcharon said:
Perfect. Appreciated.
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I use simple maths in the aisle. Each full month is 30 days, plus the extra.

July 20th is 6 full months (6x30 = 180) plus 20 days. (25 200 xxxxx)

Many places move the faded bottles up front. Dig in like you're buying yogurt or milk. If you see 24 XXXXXXX, try somewhere else. :ROFLMAO:
 
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AUSpool said:
You can test its strength and get a fairly accurate estimate. I can’t recall exact numbers but the one I tested that was 12% was 3% after 6-9 months.

Liquid Chlorine - Further Reading

www.troublefreepool.com www.troublefreepool.com
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Easy way to measure strength of bleach/liquid chlorine.

A 10,000 to 1 dilution of chlorine will result in chlorine ppm equal to its strength (percent). All you need to do is to make the 10,000 to 1 dilution, then measure the ppm using a FAS-DPD test kit. Example: If the dilution measures 8.5ppm, then your bleach strength is 8.5%.

Step 1: Measure 1 liter of Deionized or Distilled water. Here I’m measuring 1000 grams (1 liter) of water using a kitchen scale.



Step 2: Measure 0.1 ml of the bleach/liquid chlorine. This is easy to do by using a 0.3 ml u-100 insulin syringe and filling it to the 10 units mark (10 units of u-100 insulin is 0.1 ml)



Step 3: Add the 0.1 ml of bleach to the 1 liter of water and mix.

Step 4: Using a FAS-DPD test kit, measure the FC ppm (CC should be zero) of the dilution. The measured ppm is the percent strength of your bleach/liquid chlorine.

From Chlorine Date Code Decoder/Easy Way to Measure Strength.
 
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