Testing my chlorine percentage

[binovc]

I ran across the instructions for doing this test:

Chlorine Date Code Decoder/Easy Way to Measure Strength.

Just divide the day by 30 and that gives you the month. Really no need to be more accurate than that.

www.troublefreepool.com

I used distilled water, measured out 1000ml using a graduated cylinder, then added .1ml of my chlorine
using an old insulin syringe. When I added the dpd powder, it turned yellow instead of pink. Tried adding the R-0871 anyway, but nothing changed.
Any ideas what happened??
Thanks.

 

[Msch99]

Nope, I dont. Are you just curious?

Use pool math effects of adding. Bump pool up one or two ppm. Wait 30 min check FC, note the difference between results and expected. If your pool volume accurate.

 

[mknauss]

I ran across the instructions for doing this test:

Chlorine Date Code Decoder/Easy Way to Measure Strength.

Just divide the day by 30 and that gives you the month. Really no need to be more accurate than that.

www.troublefreepool.com

I used distilled water, measured out 1000ml using a graduated cylinder, then added .1ml of my chlorine
using an old insulin syringe. When I added the dpd powder, it turned yellow instead of pink. Tried adding the R-0871 anyway, but nothing changed.
Any ideas what happened??
Thanks.

You would have 100 ppm chlorine. The test reagents bleached out.

 

[binovc]

Msch99, yes curious. Not sure I trust my pool store as they store their liquid chlorine outside.
mknauss, I'm not great at math or chemistry - are the instructions in the link incorrect? It says to mix 1 liter of distilled water with .1ml of liquid chlorine?

Chlorine Date Code Decoder/Easy Way to Measure Strength.

Hi, I just joined TFP this season and pool is looking great. TFP is an awesome resource. Thanks I thought the information below might be helpful for some of the forum participants. I recently bought 1 jug of 10% Liquid Chlorine that was actually 4.5%. It had a 2013 date code. I now am very...

www.troublefreepool.com

 

[mknauss]

Msch99, yes curious. Not sure I trust my pool store as they store their liquid chlorine outside.
mknauss, I'm not great at math or chemistry - are the instructions in the link incorrect? It says to mix 1 liter of distilled water with .1ml of liquid chlorine?

Chlorine Date Code Decoder/Easy Way to Measure Strength.

Hi, I just joined TFP this season and pool is looking great. TFP is an awesome resource. Thanks I thought the information below might be helpful for some of the forum participants. I recently bought 1 jug of 10% Liquid Chlorine that was actually 4.5%. It had a 2013 date code. I now am very...

www.troublefreepool.com

1 ppm = 0.001 ml/l
10 ppm = 0.01 ml/l
100 ppm = 0.1 ml/l

 

[laprjns]

You would have 100 ppm chlorine.

mknauss, I'm not great at math or chemistry - are the instructions in the link incorrect? It says to mix 1 liter of distilled water with .1ml of liquid chlorine?

Chlorine Date Code Decoder/Easy Way to Measure Strength.

Hi, I just joined TFP this season and pool is looking great. TFP is an awesome resource. Thanks I thought the information below might be helpful for some of the forum participants. I recently bought 1 jug of 10% Liquid Chlorine that was actually 4.5%. It had a 2013 date code. I now am very...

www.troublefreepool.com

Assuming that the 0.1ml sample that you added to the 1000 ml of distilled water was 100% chlorine, then yes it would be 100 ppm. Assuming that chlorine sample was 10% chlorine then it would be 10 ppm. So the instructions are correct and something else is wrong. Maybe you added 1ml of the sample chlorine.

 

[mknauss]

Assuming that chlorine sample was 10% chlorine then it would be 10 ppm.

You are correct. I missed that!

 

[binovc]

My syringe is a 3ml size, marked in .1ml graduations. I used 1 graduation, a pretty tiny amount.
I will try the test again, I think I'm following the instructions correctly...
P.s., this window very annoyingly changes my cursor into "text replacement as you type" mode whenever I need to go back and correct any text. Guess I'm also not a computer expert.