CYA standard solution test result, can I extrapolate?

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Torrente

Torrente

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Gold Supporter
May 17, 2018
92
Panama City, Panama
I have seen other threads with people in the same case, just want to share my experience.

I just received the 50ppm CYA standard solution from TFTestkits and in my first test I only can not see the black dot at 30ppm, I have seen the Taylor videos and the photos with samples and it corresponds to what I see as 30.

I have tried with different lighting outdoor and indoor and always the same result.

I assume that the sample is correct, with this experience should I add 20ppm to my regular CYA measures?

Thank you!
 
Some photos for your consideration:
5a6dcee8325999aabad9f135f7840ba0.jpg
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I have not had any reports of a bad batch of CYA standard solution. The CYA test is, by far, the most subjective of the tests. A couple suggestions. Let the solution mix at least 60 seconds before pouring into view tube. Remember there is a +/- 10% percent error of margin within industry standards for these tests. Test with your back towards the sun and hold tube at waist level.
 
Thank you very much for the answer I have been doing that, the test is useful anyway, in these conditions I asume that I should not look to have no visibility of the black dot and I will look more for something similar to what I am measuring in these photos as 40.
I do not need extra precision as I have to add CYA regularly due to the heavy rains that we have here out of the dry season.
 
OTPirate said:
I have not had any reports of a bad batch of CYA standard solution. The CYA test is, by far, the most subjective of the tests. A couple suggestions. Let the solution mix at least 60 seconds before pouring into view tube. Remember there is a +/- 10% percent error of margin within industry standards for these tests. Test with your back towards the sun and hold tube at waist level.
Click to expand...

Perhaps I was dreaming? Or maybe it was from a different vendor.

Torrente said:
Thank you very much for the answer I have been doing that, the test is useful anyway, in these conditions I asume that I should not look to have no visibility of the black dot and I will look more for something similar to what I am measuring in these photos as 40.
I do not need extra precision as I have to add CYA regularly due to the heavy rains that we have here out of the dry season.
Click to expand...

Are you performing the test correctly? Outside, full sun at your back, hold the tube at waist level and *glance* in. If it takes longer than a glance for you to see the dot, it’s not there.
 
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JimMarshall said:
Are you performing the test correctly? Outside, full sun at your back, hold the tube at waist level and *glance* in. If it takes longer than a glance for you to see the dot, it’s not there.
Click to expand...
I think that I am doing it correctly, I might be in the edge regarding the 40ppm reading, but in the 50ppm without doubt the dot is there in any lighting condition and with a short glance.
 

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