API test kit info

[brokensword]

Yes, the simplest number is the number of drops, 6.
6 drops is 100 ppm.
That is an acceptable minimum.

Readings above that are most likely fine, unless it's an extreme amount which we need to examined on a case by case basis. I would consider anything above 22 drops (400 ppm) something to be looked at a bit closer.

Thanks, Mitch!