CYA readings are different ?

[smksignals]

Hi,

I had a RO service done 6 days ago. My CYA tests since then have shown zero. I have the TF100 kit and I fill to the top of the cylinder (above 20) and can still see the dot at the bottom. A bit cloudy, but can still see it.

I went to buy some liquid conditioner today and brought my water in to be tested. They show 20 ppm CYA.

My question is am I doing something wrong? Is their test wrong? Can I have some faulty R0013?

TIA, Kurt.

 

[jeffchap]

Pool stores are terrible at testing CYA. Trust your own testing.

 

[AK-]

How old are your reagents?

 

[smksignals]

I bought the TF100 less then a month ago. I bought the XL version. The jug of R0013 is pretty big. The sticker says 60ml but the container is the size of a large flask.

 

[AK-]

I bought the TF100 less then a month ago. I bought the XL version. The jug of R0013 is pretty big. The sticker says 60ml but the container is the size of a large flask.

Then trust your test results.

 

[mgtfp]

Reverse Osmosis can indeed remove CYA:

Reverse Osmosis - Further Reading

www.troublefreepool.com

 

[Drd]

running out of chlorine in the pool for extended periods also eats up your CYA, as bacteria feeds on it. I also realize I'm going through so much chlorine because I have high phosphates (bougenvillias!), so I'm going to use an additive to control that and add some CYA back too.

 

[Oly]

Hi,

I have the TF100 kit and I fill to the top of the cylinder (above 20) and can still see the dot at the bottom. A bit cloudy, but can still see it.

TIA, Kurt.

Assume you have less than 20ppm, maybe figure 10ppm and add CYA in 10ppm increments until you can validate with your CYA test.