Blackish staining on speed stir taylor cylinder after approximately 10 months?

[FirstVallartaPool]

Anyone have this as well and what is solution?
thanks!

 

[JVTrain]

Could be dried DPD residue. Do you rinse your vial with pool or tap water after performing tests? Try adding just a little diluted bleach to the vial, capping the top and shaking vigorously. Then rinse with water at least 7-10 times with tap water before using again.

 

[Scoop]

The best tip I read at the forum about keeping the vial clean & reducing or eliminating the black (& cloudy) buildup is to:

- Rinse with tap water after each use
- Wipe interior of vial with a paper towel.

The 2nd step has eliminated my usual problem with cloudy build-up. I haven't had to clean the vial with bleach or Muriatic Acid for ~6 months. The vial looks virtually like new.

 

[Saturn94]

The best tip I read at the forum about keeping the vial clean & reducing or eliminating the black (& cloudy) buildup is to:

- Rinse with tap water after each use
- Wipe interior of vial with a paper towel.

The 2nd step has eliminated my usual problem with cloudy build-up. I haven't had to clean the vial with bleach or Muriatic Acid for ~6 months. The vial looks virtually like new.

+1

I've been doing this for years and the vile still looks new (I don't have a Speedstir, btw).

 

[FirstVallartaPool]

Ok thanks ..a friend does testing occasionally and perhaps not tap rinsing. cleaned up perfectly with diluted muriatic acid.
I love this forum specially for a first time pool owner in another country!