# Thread: how to measure FC higher than the test kit allows

1. ## how to measure FC higher than the test kit allows

And so I am simply curious. Should I have a need to slam my pool my taylor test kit only goes up to a 5-10 for the top of the chlorine scale. It has a color match scale of (i forget the bottom one) but then 2-4, 3-5, and lastly 6-10.
If I had to slam up to say 20 (just for discussion) then how can I possibly know when at that level if my test kit only goes up to 10?

2. ## Re: how to measure FC higher than the test kit allows

Originally Posted by aodino
And so I am simply curious. Should I have a need to slam my pool my taylor test kit only goes up to a 5-10 for the top of the chlorine scale. It has a color match scale of (i forget the bottom one) but then 2-4, 3-5, and lastly 6-10.
If I had to slam up to say 20 (just for discussion) then how can I possibly know when at that level if my test kit only goes up to 10?
An fas-dpd chlorine test kit is recommended. You really can't measure accurately at high levels of FC with the color matching test that goes to 5. Even diluting the water will be giving you a guesstamate.

3. ## Re: how to measure FC higher than the test kit allows

You hit on one of the main points of the recommended kits such as the TF-100 it has an FAS-DPD FC test that can test much higher with .5 or even .2 ppm accuracy, thought there is not much need for the .2 ppm test better to save reagents and use the .5 test

4. ## Re: how to measure FC higher than the test kit allows

The FAS/DPD accurately measures FC up to 50 ppm. You can buy one TFTestkits.net

5. ## Re: how to measure FC higher than the test kit allows

and so...with the test kit I have, I am out of luck for knowing true shock reading level. Looks like pool math (should I have to shock) is what will have to be good enough to obtain desired level. Unless I buy a different kit.

6. ## Re: how to measure FC higher than the test kit allows

Pool math can get you to shock level, but doesn't help you trying to maintain it. For example if you bring to 20, then an hour later you are at 14 you are still too high to test without the proper test kit. You would have to wait until you are way too low to be doing much good until you bring back to shock level again, which isn't a very effective SLAM.

7. ## Re: how to measure FC higher than the test kit allows

You also will not be able to test for CC that is a key part of SLAM. You can buy the 3 components for the FAS-DPD test separately but when you start to piecing things together you quickly get to the point it makes more sense to buy the whole kit. Since you are a supporter you can get a 10 discount at TFtestkits.net on the TF-100

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