CYA test

[PoolGate]

The 50 is 60. Great to know. Maybe I’ll email them and let them know. I just pretend I have 30. I can also read the bottom line of an eye exam chart. That’s my down fall.

Actually the 50 is 40. I changed my post on that.

 

[thegreenblade]

I totally understand. Maybe tomorrow you will think it’s 60. Keep us posted.

 

[cfherrman]

I keep the sun at my back and the tube at my side as well so no shades hit the tube.

The glance method is truly superior as it gets your mind out of it. If you glance and see no dot and then keep looking you will see the dot in 5-10 seconds.

If you use the k2006 tube get the stand alone cya tube, it's way better

 

[splashpad]

I got a Taylor test solution of 50 parts CYA and when I fill the tube to exactly 50 I can still see the dot. So taking it until the dot "disappears" I think will give you a reading higher than it actually is.

It would actually be a LOWER cya level (you would be filling PAST the 50 mark, to 40 or 30), more sample water equals LESS CYA level

 

[splashpad]

The 50 is 60. Great to know. Maybe I’ll email them and let them know. I just pretend I have 30. I can also read the bottom line of an eye exam chart. That’s my down fall.

The standard always looks like 40 to me.

thegreenblade, you need more light on your tester tube, kelly you need less light on your tester tube
Try it, inside with a flashlight, point it through the tube, vs above & straight down the tube, vs angled at the dot from the side of the tube

I thought the point was to see what an actual, measured, verified 50 part sample would look like. Why else would they sell it? I don't think it matters where you look at it but now you know what to look for when you test your actual water. And I see from this sample that I have less CYA than I thought I was testing and that the dot doesn't totally disappear. In fact, it is a good 10 point lower than I was testing. I would have called their sample 40.

Exactly!! THIS is why it is suggested to GLANCE for the dot, not "look" for the dot (in "optimal" test tube lit conditions)

 

[PoolGate]

Here is my test solution calibrated at 50ppm CYA looking from outside the house slightly overcast. I filled the tube to exactly the 50 mark. I can clearly still see the dot.

 

[splashpad]

Here is my test solution calibrated at 50ppm CYA looking from outside the house slightly overcast. I filled the tube to exactly the 50 mark. I can clearly still see the dot.

Overcast, not enough light B-)

And I would call it 50, since the dot is obscured, even with focused pic :-D

 

[pabeader]

I think that means there isn't enough incident light to obscure the dot. With a turbidity test, from what I've been told, it's the light scattering off the suspended particles that causes the obstructed view.

 

[thegreenblade]

Looks like the standard solution is bad to me. Thanks now I know not to buy it.

 

[thegreenblade]

Here is my test solution calibrated at 50ppm CYA looking from outside the house slightly overcast. I filled the tube to exactly the 50 mark. I can clearly still see the dot.

Can you try it with sunglasses on and indoors again?

 

[kellyfair]

Splash, I do it outside in full sun. Looks like 40 to me.

I’m confident in my CYA testing. No worries!

 

[PoolGate]

Actually I forgot, I did do this indoors as well. No difference.

- - - Updated - - -

Splash, I do it outside in full sun. Looks like 40 to me.

I’m confident in my CYA testing. No worries!

Correct, if I filled to the 40 mark the dot would be gone.

 

[splashpad]

I think that means there isn't enough incident light to obscure the dot. With a turbidity test, from what I've been told, it's the light scattering off the suspended particles that causes the obstructed view.

Correct!!

 

[pabeader]

May just need to move fingers up to the top of the tube.

 

[otter86753]

Have you tried holding the tube at different angles to the sun such as to the side? That is when I got the standard to read exactly 50 ppm, which is the whole point of the exercise.

 

[PoolGate]

Have you tried holding the tube at different angles to the sun such as to the side? That is when I got the standard to read exactly 50 ppm, which is the whole point of the exercise.

Why? Honestly I don't care if the dot disappears or not. I found what I need to see when I am measuring it and I am cool with that.

 

[pabeader]

 

[eripaulie]

Wow, this is what 50 looks like? I have been reading my tests wrong for 8 years now because I consider this photo as "still being able to see the dot". I would have added more to make "my" reading lower than what it actually is.

 

[Poolzzz]

No, it's not what 50 looks like. I can clearly see the dot in the above photo. Check the Taylor instructional videos to see what it should look like. The dot disappears at 50 exactly as they indicate for me. But you still may be getting the wrong answer the last 8 years...you'll never know unless you splurge $5 and buy the Standard Solution to test yourself.

 

[PoolGate]

No, it's not what 50 looks like. I can clearly see the dot in the above photo. Check the Taylor instructional videos to see what it should look like. The dot disappears at 50 exactly as they indicate for me. But you still may be getting the wrong answer the last 8 years...you'll never know unless you splurge $5 and buy the Standard Solution to test yourself.

It is according to the measured 50ppm reference solution. I have done that test twice now. I'd love for someone else to get and test it.

R-7065 CYA Standard 50 ppm (2 ounces)