TFTest larger CYA tube

[smforte]

Have been using Taylor 2006 CYA test for couple of years. CYA runs 40-50 pretty consistently. My tube started getting a little grungy so ordered the larger tube and got a reading of 30. Am I doing something wrong with the bigger tube? Did it numerous times. Thoughts?

 

[JVTrain]

If it was really grungy, it may have been letting in less light than a clean tube, leading to the dot disappearing sooner. Did you do the testing in full sun at your back in all cases? Try cleaning out the old tube by soaking/shaking in dilute bleach solution if you have not already thrown it out, then compare the two.

 

[fannd]

If it was really grungy, it may have been letting in less light than a clean tube, leading to the dot disappearing sooner. Did you do the testing in full sun at your back in all cases? Try cleaning out the old tube by soaking/shaking in dilute bleach solution if you have not already thrown it out, then compare the two.

Does the dot have to actually disappear completely? I am unsure of my reading because I can see the dot when the tube is filled to the top, but it is cloudy looking.

 

[JVTrain]

Does the dot have to actually disappear completely? I am unsure of my reading because I can see the dot when the tube is filled to the top, but it is cloudy looking.

Extended Test Kit Directions See this thread that has details on all the tests.

"Continue pouring until all traces of the black dot at the bottom of the view tube completely disappear..."

 

[smforte]

My old tube is clear but the black dot has flaked off in some spots. Puzzled by the different reading. Of course didn't think to test at the same time with the old tube also. I had just tested a few days ago w old tube and was at 50. Have to keep it there cause this awful heat in AL loves my FC. And yes tested w sun at back etc the way I always do. Thought w the larger tube maybe I needed to add more of something.

 

[Kmaz]

Which mixing bottle are you using ?..... Is the pool water fill line labelled 15 then fill with reagent to the break at the top?
Taylor does make a couple different size mixing bottles.
Kris

 

[smforte]

Using the one marked 7....I add water to 7 then the cya regent .... Could that be my prob?

 

[Kmaz]

I think that's the one made for the comparator block with both ph and cya.
You want the bottle with part # 9194. You have the 9191. Or the one from tftest kits.this applies to the taylor view tube that goes to 20
Kris

 

[smforte]

Thanks Kmaz, ill have to order one,,,in meantime how much of pool water vs regent would I add to something I could use for now?

 

[Kmaz]

Use your graduated cylinder 15ml of each preferably in very small squeeze bottle so you can shake it
Kmaz

 

[Durk]

It really doesn't matter what mixing bottle you use as long as:

1) the mix is 50/50 pool water and reagent
2) it makes enough mixture to fully occlude the black dot.

If your CYA levels are high enough, it makes sense to use the smaller bottle with the larger tube to save on reagent.

 

[Kmaz]

It really doesn't matter what mixing bottle you use as long as:

1) the mix is 50/50 pool water and reagent
2) it makes enough mixture to fully occlude the black dot.

If your CYA levels are high enough, it makes sense to use the smaller bottle with the larger tube to save on reagent.

That...

 

[smforte]

Thanks yall...not really worried about the regents....I bought a large bottle end of last year