CYA results from two different tests differ.

[superquiet]

I have an HTH test kit and then purchased a TF-100 kit. I am getting different results between the two kits. The HTH kit uses a 1 to 1 ratio for cyanuric acid test. 7 mL of water plus 7 mL of CYA.

For the TF-100 kit, I measured the water in the mixing bottle. Filled to the bottom of the label is 10 mL. Filled to the top of the label is 25 mL. So it is 10 mL of water and 15 mL of CYA. This is a ratio of 1.5 to 1. Does this mean the label on the bottle is located too close to the bottom of the bottle?

Thanks

 

[Newdude]

Does this mean the label on the bottle is located too close to the bottom of the bottle?

Yes. My old label moved around everytime it got wet and I had to consciously put it back to the mid point of the bottle. The new bottles are stamped.

The TF100 or any Taylor CYA test uses a 1:1 ratio. You can use the squirter bottle or anything else of your choice to measure, such as a syringe or half tablespoon.

 

[JoyfulNoise]

The ratio of water to reagent doesn’t need to be precisely 1:1. The reagent is designed to add an excess of melamine to the solution so that it reacts with all of the CYA. There are also pH adjusters to ensure that the resulting mixture is mildly acidic so that the melamine reacts in a repeatable way.

That said, there is a report lately that’s come to my attention that some CYA reagents (not Taylor brand ones) use different chemicals to remove chlorine from the sample. This also has the unfortunate effect of reacting with calcium in the water and thus forming a calcium precipitate that positively interferes with the results. The Taylor chemistry is formulated to avoid calcium interference. So, you should consider the Taylor test to be the Gold Standard as it is properly formulated to work with water samples that have relatively high mineral hardness.

 

[Bperry]

I have an HTH test kit and then purchased a TF-100 kit. I am getting different results between the two kits. The HTH kit uses a 1 to 1 ratio for cyanuric acid test. 7 mL of water plus 7 mL of CYA.

For the TF-100 kit, I measured the water in the mixing bottle. Filled to the bottom of the label is 10 mL. Filled to the top of the label is 25 mL. So it is 10 mL of water and 15 mL of CYA. This is a ratio of 1.5 to 1. Does this mean the label on the bottle is located too close to the bottom of the bottle?

Thanks

The tf-100 test is also 1:1 ratio. There must be something wrong with the bottle if it isn’t labeled as such.

 

[superquiet]

I purchased the TF-100 kit this summer. The label does not move around it is stuck to the bottle. It states: Fill with water to the bottom of the label and fill with CYA to the top of the label. Based on the response here, apparently the fixture being use for placing the labels on the bottles is not quit correct.

 

[Newdude]

The label does not move around it is stuck to the bottle

Get it good and wet and see if you can slide it back to the top edge, approximating 50/50.

 

[flynwill]

FWIW my TF kit came with the label way too low for the instructions as well. I just added sharpie marks on the side of the bottle.