# Thread: Am I measuring FC correctly?? What does CC tell me?

1. ## Am I measuring FC correctly?? What does CC tell me?

Hello - I have a Taylor K-2006 test kit. I'm not sure I'm following the instructions on the box correctly to test for FC. I'm filling comparator tube to 25ml. Adding (2) level dippers of R-0870 and swirling to dissolve. Color turns red. Then adding R-0871 by drop, swirling, counting until red sample turns colorless. Then multiplying the amount of drops by 0.2.

Today it took 32 drops for the sample to turn colorless. I multiplied 32 by 0.2 and got 0.64. I'm mathematically challenged so does this mean 6.4 ppm of FC?

I've not continued the test to calculate the CC. What is CC and why do I need that beyond testing for FC? Thank you!

2. ## Re: Am I measuring FC correctly?? What does CC tell me?

32 x 0.2 is 6.4 so that is correct. However, you can use 10 ml and multiply by 0.5 to save time and reagent.

See the link in my signature for a video.

3. ## Re: Am I measuring FC correctly?? What does CC tell me?

Hello - I have a Taylor K-2006 test kit. I'm not sure I'm following the instructions on the box correctly to test for FC. I'm filling comparator tube to 25ml. Adding (2) level dippers of R-0870 and swirling to dissolve. Color turns red. Then adding R-0871 by drop, swirling, counting until red sample turns colorless. Then multiplying the amount of drops by 0.2.

Today it took 32 drops for the sample to turn colorless. I multiplied 32 by 0.2 and got 0.64. I'm mathematically challenged so does this mean 6.4 ppm of FC?

I've not continued the test to calculate the CC. What is CC and why do I need that beyond testing for FC? Thank you!
Combined Chlorine is sort of the half-used chlorine which is what you actually smell in a public pool when someone says, "Whoa! That chlorine smell is strong!" There is usually some, as there is a constant flow of organic matter, dead skin, snot, whatever in the water that the chlorine oxidizes. If it's below .5, we say it's fine. If it's above .5, there's a lot of stuff in the water and you need to take care of it. Incidentally, it's the CC that usually irritates your skin.

Use the 10 ml sample and multiply by .5. It's faster and uses fewer drops and is plenty accurate. Also, you may not need two full dippers of powder. My rule of theumb is if there's an undissolved granule or two left in the sample after mixing, it's enough. Somehow, those granules dissolve when the drops are added.

4. ## Re: Am I measuring FC correctly?? What does CC tell me?

Hi Lisa,

Just to mention, when you do the CC test, do it right away after measuring FC. If you take too long, then the FC test you just did will turn a little bit pink again.

5. ## Re: Am I measuring FC correctly?? What does CC tell me?

CC is also a compound formed when chlorine combines with ammonia....and we all know where that comes from!

6. ## Re: Am I measuring FC correctly?? What does CC tell me?

Post your new results when you do them!

7. ## Re: Am I measuring FC correctly?? What does CC tell me?

woody!! Stop that!

Lisa,
think of chlorine like this.
FC is the Good Guys
Algae and pathogens is the Bad Guys

It's the good guys always battling the bad guys.

As the battle ensues, inevitably, some of the Good Guys are not going to make it. The CC's tells who is winning the battle.

If the CC is .5 or less, then the good guys are winning
if the CC is more than .5, then the bad guys are winning and possibly some stronger reinforcements are needed

8. ## Re: Am I measuring FC correctly?? What does CC tell me?

I did the CC test yesterday and it was 0. Guess my good guys are winning... for now!

yeah baby!