FC and CC test

[JMyrick106]

I am testing my FC and TC per the Chlorine Drop Test instructions on my TFTestKit I recently received. Seems rather straight forward but when I add the R-0871 solution one drop at a time the mixture will gradually turn from pink to clear as per directions . But the solution will only stay completely clear for say 30 seconds and gradually I t begins to it go back to a shade of pink--

My question is --Is it accurate to take the reading when solution goes completely clear?? Why does it turn back to pink ? Am I to keep adding drops until it stays clear permanently ?

Thanks !

 

[DKT113]

It does say in the extended directions if you leave it sit it will repinken (is that a word?, they didn't use repinken in extended directions, it just came off of these fingers naturally) ~ anyways it does say pink will come back in a minute or two. 30 seconds seems awfully quick, do you agitate by hand or do you have the speed stir?

 

[jblizzle]

That is normal. It will always turn back to pink if you wait long enough. If it is clear for a few seconds, you are done.

When the sample is clear, you are done with the FC portion.
Then add the 5 drops of R-0003 and count to clear again, then the CC is done.

 

[JMyrick106]

That's good to know --I must have misplaced those directions as I'm just looking at the laminated directions they sent--and I did not see anything referencing that --i can stop wasting the solution now-- 30 seconds was Just a guess I never really timed it--just knew it was not instantaneous ..

Thnx

 

[jblizzle]

The extended instructions are on the forum in Pool School.