R-0007 - what is it an why

Billtkat

Well-known member
Apr 25, 2020
89
Oro Valley, AZ
I noticed the Alkalinity teat kit has an extra step to test alkalinity - 2 drops of R-0007. Why and what is it ? The HTH kit i purchased a couple months back , before I knew about and now have my TF100 only has 2 steps . 5 drops of indicator and drop by drop of the titrant.
Because I new using the TF100 and some results could be based on me doing something wrong I do use both to compare as a guide to see if I am OK in my testing. All test are coming out the same except this one - When I use the HTH , 2 step I get a result of 100. When I use the TF100 with the 3 steps I get 140 - Got to be me or the R-0007 , 2 drops I add does something that creates the variance -
 

Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
4,421
NW Ohio
It's a chlorine neutralizer. Chlorine can bleach out the R-0008 so Taylor includes the neutralizer to prevent this from happening.

Are you wiping the R-0009 tip while doing the test? Because TFTestkits gets such new product from Taylor the bottles sometimes carry a static charge which can cause the drops to jump away from the bottle before they are fully formed, causing a falsely high result. Wiping the bottle between drops can help that. This static charge will go away over time, it is just due to the extremely new product.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,093
Northern NJ
R-0007 is sodium thiosulfate which neutralizes chlorine which can interfere with the TA test endpoint. Chlorine can cause the endpoint to be yellow or clear rather then pink.
 

Billtkat

Well-known member
Apr 25, 2020
89
Oro Valley, AZ
Thanks so the
It's a chlorine neutralizer. Chlorine can bleach out the R-0008 so Taylor includes the neutralizer to prevent this from happening.

Are you wiping the R-0009 tip while doing the test? Because TFTestkits gets such new product from Taylor the bottles sometimes carry a static charge which can cause the drops to jump away from the bottle before they are fully formed, causing a falsely high result. Wiping the bottle between drops can help that. This static charge will go away over time, it is just due to the extremely new product.
I will try that as the drops were coming out but not like a good well formed drop as in other test if that makes sense - Maybe that is the issue as the results were way off between the two - I am hoping it is user error
 

Billtkat

Well-known member
Apr 25, 2020
89
Oro Valley, AZ
R-0007 is sodium thiosulfate which neutralizes chlorine which can interfere with the TA test endpoint. Chlorine can cause the endpoint to be yellow or clear rather then pink.
So the HTH kit allows the chlorine, which I know I have (FC of 3.5) to stay and drives the results lower ?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,093
Northern NJ
So the HTH kit allows the chlorine, which I know I have (FC of 3.5) to stay and drives the results lower ?
It messes with you seeing the precise color change. You see a color change before you should with the chlorine bleaching out some of the color. Thus a low reading.
 
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Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
4,421
NW Ohio
No, the HTH just cuts cost by not including this step. The presence of chlorine does not affect the results, but it could affect the color of the test at higher chlorine levels (such as during a SLAM). If the colors get bleached out the test is still accurate because the change in color still happens, but it is more difficult to tell when that change happens. This can happen with the Taylor too, but at chlorine levels well in excess of anything we would ever recommend.
 
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Billtkat

Well-known member
Apr 25, 2020
89
Oro Valley, AZ
OK , wiping the tip did help for sure. I used my speed stir to mix between purposeful drops. At 10 the first sign of red / pink (with the light on it looks pink to me) shows then flips back into green - At 11 drops the water is clear to light pink with light on while spinning , then at 12 it is red. I assume the full red or dark pink is the 120 i would record , correct ?
BTW - that little spinning thing was well worth the purchase ! I use it on everything it calls for mixing except CYA and the Chlorine test with the powder -