CYA testing volumes

[velezs]

When doing the CYA test with R-0013, it requires 7 ml of sample water and reagent, each, for a total volume of 14 ml. The tube with the black dot seems to have a capacity of just over 10 ml.
Does it make a difference if instead of preparing 14 ml for the test one would prepare 10 ml instead, maintaining the proportions (1:1) specified above (5 ml sample and 5 ml reagent)? Specially if you expect the CYA to be ~ 50 or higher (halfway up the tube).
Thanks in advance! I also want to say that I have enjoyed learning from the posts and the articles in Pool School. I have solved a few issues being a new pool owner.

 

[proavia]

As long as you maintain the 1 to 1 ratio, it's fine.
I wouldn't use less than a 5 ml sample size though.

Consider using a childs medicine syringe to get a more precise liquid quantity. They are cheap and available at most any drug store/pharmacy.

 

[nabril15]

When doing the CYA test with R-0013, it requires 7 ml of sample water and reagent, each, for a total volume of 14 ml. The tube with the black dot seems to have a capacity of just over 10 ml.
Does it make a difference if instead of preparing 14 ml for the test one would prepare 10 ml instead, maintaining the proportions (1:1) specified above (5 ml sample and 5 ml reagent)? Specially if you expect the CYA to be ~ 50 or higher (halfway up the tube).
Thanks in advance! I also want to say that I have enjoyed learning from the posts and the articles in Pool School. I have solved a few issues being a new pool owner.

As long as you maintain the 1 to 1 ratio, it's fine.

I use 10ml of the reagent and 10 of water. As Proavia says, as long as you maintain the 1:1 ratio, the volume is insignificant, but you obviously want to have enough liquid to be able to do the test correctly and not have a lot of extra in the cylinder.

 

[velezs]

Thanks! Makes sense. Just wanted to double check what I had been doing wasn’t for some reason altering the result.