Negative CC

[TeenaTeens]

Hi I seem to have a negative CC number.

FC 4 TC 2 which comes out to -2 CC according to my calculations.

Is this ok? Is it recorded as 0 in pool math which doesn’t allow for negative numbers?

 

[PoolGate]

Are you using guess strips or a proper test kit?

 

[Wobblerlorri]

You test for CC in the TFP method. We don't calculate it, nor do we worry about TC. We use the FAS-DPD method to test for FC then, using that same solution you just tested, we test for CC.

Don't use the OTO method. It's only accurate up to 5 ppm FC, and TFP pools generally have a higher FC than that.

 

[TeenaTeens]

Proper Taylor’s test kit. Even had my other half confirm my color matching so it’s definitely the right numbers.

 

[PoolGate]

Proper Taylor’s test kit. Even had my other half confirm my color matching so it’s definitely the right numbers.

Cool! But where are you getting TC from?

 

[TeenaTeens]

You test for CC in the TFP method. We don't calculate it, nor do we worry about TC. We use the FAS-DPD method to test for FC then, using that same solution you just tested, we test for CC.

Don't use the OTO method. It's only accurate up to 5 ppm FC, and TFP pools generally have a higher FC than that.

Honestly I don’t know what any of this means? I just used the Taylor test for FC. Then added the extra drops for TC. Then did the math.

 

[TeenaTeens]

Cool! But where are you getting TC from?

By following these instructions

 

[Wobblerlorri]

Yeah, don't use the OTO block, the color comparator block. Use an FAS-DPD kit and test your FC and CC. What Taylor kit are you using? We recommend either the TF-100 from TF Test Kits or the Taylor K-2006C Test Kits Compared.

 

[TeenaTeens]

Yeah, don't use the OTO block. Use an FAS-DPD kit and test your FC and CC. What Taylor kit are you using? We recommend either the TF-100 from tftestkits.net or the Taylor K-2006C Test Kits Compared.

I don’t know - it’s the Taylors one made for Leslie’s

 

[TeenaTeens]

This is it

 

[TeenaTeens]

Yeah, don't use the OTO block, the color comparator block. Use an FAS-DPD kit and test your FC and CC. What Taylor kit are you using? We recommend either the TF-100 from TF Test Kits or the Taylor K-2006C Test Kits Compared.

What’s an OTO block/test

 

[TeenaTeens]

Yeah, don't use the OTO block, the color comparator block. Use an FAS-DPD kit and test your FC and CC. What Taylor kit are you using? We recommend either the TF-100 from TF Test Kits or the Taylor K-2006C Test Kits Compared.

Ok I think I understand. I need this right? I don’t need an entire new test kit do I?

 

[MITBeta]

That kit has everything you need except for a FAS-DPD chlorine test. The color comparitor test (OTO) doesn't go up high enough for Trouble Free Pool methods, and isn't particularly accurate either. It's good for seeing IF there's chlorine in the pool, but not great for saying how much.

You should augment the kit with this: FAS/DPD Chlorine & CC's test

Edit: in reply to your last post - YES!

 

[Wobblerlorri]

OTO stands for orthotolidine, which is the reagent used for the OTO test. You run it using the little block with colors on it, the same one you test for pH with. It looks like this. Ignore the text in the picture.

 

[TeenaTeens]

Ok I think I understand. I need this right? I don’t need an entire new test kit do I?

Or this actually…

 

[TeenaTeens]

That kit has everything you need except for a FAS-DPD chlorine test. The color comparitor test (OTO) doesn't go up high enough for Trouble Free Pool methods, and isn't particularly accurate either. It's good for seeing IF there's chlorine in the pool, but not great for saying how much.

You should augment the kit with this: FAS/DPD Chlorine & CC's test

Edit: in reply to your last post - YES!

Thank you! I get what you are saying now. I will order one. Appreciate the help. And the patience

 

[Wobblerlorri]

In answer to your last post: YES!! That's the FAS-DPD test. That's what you need!

 

[MITBeta]

You want a kit that includes a vial for testing. The first one you posted is good when you need refills.

 

[TeenaTeens]

Thank you! I get what you are saying now. I will order one. Appreciate the help. And the patience

Thank you! I get what you are saying now. I will order one. Appreciate the help. And the patience

One more thing - but if I was using the calculation method - am I doing it correctly? Is the number I got at all accurate?

 

[Wobblerlorri]

Yes, it's fine. Inaccurate for TFP purposes, but fine. You would record it as 0 CC.