CYA test is pretty subjective, isn't it?

[mrmrk49]

I would have said "keep going, I can still see outline of the dot"

Excellent pictures by the way!

MikeK

[cygnusecks]

Cool pictures.. I thnk I'll post them next time I have to "make the call".

Someone said I can dump my test water back into the squeeze bottle and re-use it???? So I *never ever* have to buy reagent ever again?

[edarling]

cygnusecks - I believe they meant that they can use the same sample to take another look at the results in case of doubt. You have to do it all over again for the other tests, but this test you can just add the same sample back into the tube to see if your eyes see the same thing.

My question always has been - how high is waist high? I'd rather Ben put a number like 2 feet, 18 inches, etc. on the instructions. I'm over 6', but someone else may be 4'6" and have shorter to their waist.

Glad to read that it is as subjective as I thought.

[waterbear]

Regarding the pics above I would say it is in the neighborhood of 20 ppm and that is close enough for government work! It I got that reading I would bump up the CYA bit until it read around 30 or 40 ppm.

As far as how high is waist high? The important point is that the tube is not 6 inches below you eyes but at about a level of your upper arms straight down and your forarm at 90 deg. to them, which for most people would put your hand holding the tube somewhere around your navel. It's not rocket science! You just don't want to be peering right into the top of the tube like it was a microscope. Holding the tube 10 inches higher or lower than someone else is not going to change the reading by any significant amouht!

Hope this helps.