Testing CYA with dilution

[Hermskii]

Watermom, please explain this more? I'm curious...

Here is what you had said:

Mix a cup of pool water with a cup of distilled water and use that to run the CYA test again but multiply your results by 2. Glad to be here too by the way.

[Watermom]

Watermom, please explain this more? I'm curious...

Here is what you had said:

Mix a cup of pool water with a cup of distilled water and use that to run the CYA test again but multiply your results by 2. Glad to be here too by the way.

100 is the highest number on the tester so if you get a reading of 100, it means your CYA may be 100 or any number past that. So, if you do a dilution, it can help us to get a more accurate reading. (Of course, if your CYA is over 200, you'll still get a reading of 100 and may need to dilute the sample further.)

[PoolDoc]

. . . membership updated.

[Hermskii]

Very good. Now I know. Thank you!

Wait! So I have and use the Taylor K2006 test kit. With it (to test my CYA), I'd normally fill a little plastic dispenser provided in the test kit up to 7ml with pool water and then add another 7ml more of the R-0013 reagent and then mix it for 30 seconds. Then I'd start adding it to the tester until I could not see the dot anymore. That's 7ml of pool-water and 7ml of R-0013 reagent.

In your suggestion you are mixing equal parts pool water and distilled water but doubling the result when poured over the black dot till it disappears. Would that mean that distilled water is nearly the same thing as R-0013 except that it is twice as clear? By the book, I never have to buy R-0013 again if I use your procedure correct?

[PoolDoc]

You only should mix pool water with distilled when your CYA level is HIGH. If it's low (clear!), then there's no point.

[BigDave]

... I'd normally fill a little plastic dispenser provided in the test kit up to 7ml with pool water and then add another 7ml more of the R-0013 reagent and then mix it for 30 seconds. Then I'd start adding it to the tester until I could not see the dot anymore. That's 7ml of pool-water and 7ml of R-0013 reagent.

Right!

In your suggestion you are mixing equal parts pool water and distilled water but doubling the result when poured over the black dot till it disappears. Would that mean that distilled water is nearly the same thing as R-0013 except that it is twice as clear? By the book, I never have to buy R-0013 again if I use your procedure correct?

Not quite right!
To measure CYA higher than 100 (max of test), one would dilute the pool water sample with water that contains no CYA. Perform the CYA test using equal parts diluted pool water and R-0013. Read the CYA in the diluted sample the multiply by the dilution factor(2 for a 1 part pool water + 1 part distilled).

[Hermskii]

Ahhhhhhh! OK. That made it clear. Thanks!

See, I was wondering what would cause the cloudiness of the test water. I was thinking you were just adding the 1/2 cup pool water with 1/2 cup of distilled water. I was thinking you were just using the distilled water in the place of the R-0013 reagent. Thanks again for clearing that up!